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ඔබ මෙතනයි:  මුල් පිටුව

Year 2021 Astronomy Calendar

ඊ-තැපැල මුද්‍රණය පී.ඩී.එෆ් (PDF)
2021

Celestial Events in 2021 - Astronomy Calendar

Date
Event Description

January

2, 3 Quadrantids Meteor Shower The Quadrantids is an above average shower, with up to 40 meteors per hour at its peak. It is thought to be produced by dust grains left behind by an extinct comet known as 2003 EH1. The shower runs annually from January 1-5. It peaks this year on the night of the 2nd and morning of the 3rd. Meteors will radiate from the constellation Bootes but can appear anywhere in the sky.
13 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
24 Mercury at Greatest Eastern Elongation The planet Mercury reaches greatest eastern elongation of 18.6 degrees from the Sun. This is the best time to view Mercury since it will be at its highest point above the horizon in the evening sky. Look for the planet low in the western sky just after sunset.
28 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Wolf Moon because this was the time of year when hungry wolf packs howled outside their camps. In Sri Lanka, its known as Duruthu Full Moon.

February

11 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
27 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Snow Moon because the heaviest snows usually fell during this time of the year. In Sri Lanka, its known as Nawam Full Moon

March

6 Mercury at Greatest Western Elongation The planet Mercury reaches greatest western elongation of 27.3 degrees from the Sun. This is the best time to view Mercury since it will be at its highest point above the horizon in the morning sky. Look for the planet low in the eastern sky just before sunrise.
13 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
20 March Equinox The Sun will shine directly on the equator and there will be nearly equal amounts of day and night throughout the world. This is also the first day of spring (vernal equinox) in the Northern Hemisphere and the first day of fall (autumnal equinox) in the Southern Hemisphere.
20 Venus at Greatest Western Elongation The planet Venus reaches greatest eastern elongation of 46.6 degrees from the Sun. This is the best time to view Venus since it will be at its highest point above the horizon in the morning sky. Look for the bright planet in the eastern sky before sunrise.
28 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Worm Moon because this was the time of year when the ground would begin to soften, and the earthworms would reappear. In Sri Lanka, its known as Madin Full Moon.

April

12 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
22, 23 Lyrids Meteor Shower The Lyrids is an average shower, usually producing about 20 meteors per hour at its peak. It is produced by dust particles left behind by comet C/1861 G1 Thatcher, the shower runs annually from April 16-25. It peaks this year on the night of the night of the 22nd and morning of the 23rd. These meteors can sometimes produce bright dust trails that last for several seconds. Best viewing will be from a dark location after midnight. Meteors will radiate from the constellation Lyra but can appear anywhere in the sky.
27 Full Moon, Supermoon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Pink Moon because it marked the appearance of the moss pink, or wild ground phlox, which is one of the first spring flowers. In Sri Lanka, its known as Bak Full Moon. This is also the first of three supermoons for 2021. The Moon will be near its closest approach to the Earth and may look slightly larger and brighter than usual.

May

6, 7 Eta Aquarids Meteor Shower The Eta Aquarids is an above average shower, capable of producing up to 60 meteors per hour at its peak. Most of the activity is seen in the Southern Hemisphere. In the Northern Hemisphere, the rate can reach about 30 meteors per hour. It is produced by dust particles left behind by comet Halley, which has been observed since ancient times. The shower runs annually from April 19 to May 28. It peaks this year on the night of May 6 and the morning of the May 7. Best viewing will be from a dark location after midnight. Meteors will radiate from the constellation Aquarius but can appear anywhere in the sky.
11 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
17 Mercury at Greatest Eastern Elongation. The planet Mercury reaches greatest eastern elongation of 22 degrees from the Sun. This is the best time to view Mercury since it will be at its highest point above the horizon in the evening sky. Look for the planet low in the western sky just after sunset.
26 Full Moon, Supermoon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Flower Moon because this was the time of year when spring flowers appeared in abundance. In Sri Lanka, its known as Vesak Full Moon. This is also the second of three supermoons for 2021. The Moon will be near its closest approach to the Earth and may look slightly larger and brighter than usual.
26 Total Lunar Eclipse A total lunar eclipse occurs when the Moon passes completely through the Earth's dark shadow, or umbra. During this type of eclipse, the Moon will gradually get darker and then take on a rusty or blood red color. The eclipse will be visible throughout the Pacific Ocean and parts of eastern Asia, Japan, Australia, and western North America. (NASA Map and Eclipse Information). This will not be clearly visible in Sri Lanka.

June

10 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
10 Annular Solar Eclipse An annular solar eclipse occurs when the Moon is too far away from the Earth to completely cover the Sun. This results in a ring of light around the darkened Moon. The path of this eclipse will be confined to extreme eastern Russia, the Arctic Ocean, western Greenland, and Canada. A partial eclipse will be visible in the northeastern United States, Europe, and most of Russia. (NASA Map and Eclipse Information) (NASA Interactive Google Map) This will not be visible in Sri Lanka.
21 June Solstice The North Pole of the earth will be tilted toward the Sun, which will have reached its northernmost position in the sky and will be directly over the Tropic of Cancer at 23.44 degrees north latitude. This is the first day of summer (summer solstice) in the Northern Hemisphere and the first day of winter (winter solstice) in the Southern Hemisphere.
24 Full Moon, Supermoon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Strawberry Moon because it signaled the time of year to gather ripening fruit. It also coincides with the peak of the strawberry harvesting season. In Sri Lanka, its known as Poson Full Moon.. This is also the last of three supermoons for 2021. The Moon will be near its closest approach to the Earth and may look slightly larger and brighter than usual.

July

4 Mercury at Greatest Western Elongation The planet Mercury reaches greatest western elongation of 21.6 degrees from the Sun. This is the best time to view Mercury since it will be at its highest point above the horizon in the morning sky. Look for the planet low in the eastern sky just before sunrise.
10 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
24 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Buck Moon because the male buck deer would begin to grow their new antlers at this time of year. In Sri Lanka, its known as Äsala Full Moon.
28, 29 Delta Aquarids Meteor Shower The Delta Aquarids is an average shower that can produce up to 20 meteors per hour at its peak. It is produced by debris left behind by comets Marsden and Kracht. The shower runs annually from July 12 to August 23. It peaks this year on the night of July 28 and morning of July 29. Best viewing will be from a dark location after midnight. Meteors will radiate from the constellation Aquarius but can appear anywhere in the sky.

August



2 Saturn at Opposition The ringed planet will be at its closest approach to Earth and its face will be fully illuminated by the Sun. It will be brighter than any other time of the year and will be visible all night long. This is the best time to view and photograph Saturn and its moons. A medium-sized or larger telescope will allow you to see Saturn's rings and a few of its brightest moons.
8 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
12, 13 Perseids Meteor Shower The Perseids is one of the best meteor showers to observe, producing up to 60 meteors per hour at its peak. It is produced by comet Swift-Tuttle. The Perseids are famous for producing a large number of bright meteors. The shower runs annually from July 17 to August 24. It peaks this year on the night of August 12 and the morning of August 13. Best viewing will be from a dark location after midnight. Meteors will radiate from the constellation Perseus but can appear anywhere in the sky.
19 Jupiter at Opposition The giant planet will be at its closest approach to Earth and its face will be fully illuminated by the Sun. It will be brighter than any other time of the year and will be visible all night long. This is the best time to view and photograph Jupiter and its moons. A medium-sized telescope should be able to show you some of the details in Jupiter's cloud bands. A good pair of binoculars should allow you to see Jupiter's four largest moons, appearing as bright dots on either side of the planet.
22 Full Moon, Blue Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Sturgeon Moon because the large sturgeon fish of the Great Lakes and other major lakes were more easily caught at this time of year. Since this is the third of four full moons in this season, it is known as a blue moon. This rare calendar event only happens once every few years, there are normally only three full moons in each season of the year. But since full moons occur every 29.53 days, occasionally a season will contain 4 full moons. The extra full moon of the season is known as a blue moon. Blue moons occur on average once every 2.7 years. In Sri Lanka, its known as Nikini Full Moon.

September

7 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
14 Neptune at Opposition The blue giant planet will be at its closest approach to Earth and its face will be fully illuminated by the Sun. It will be brighter than any other time of the year and will be visible all night long. This is the best time to view and photograph Neptune. Due to its extreme distance from Earth, it will only appear as a tiny blue dot in all but the most powerful telescopes.
14 Mercury at Greatest Eastern Elongation The planet Mercury reaches greatest eastern elongation of 26.8 degrees from the Sun. This is the best time to view Mercury since it will be at its highest point above the horizon in the evening sky. Look for the planet low in the western sky just after sunset.
20 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Corn Moon because the corn is harvested around this time of year. In Sri Lanka, its known as Binara Full moon.
22 September Equinox The Sun will shine directly on the equator and there will be nearly equal amounts of day and night throughout the world. This is also the first day of fall (autumnal equinox) in the Northern Hemisphere and the first day of spring (vernal equinox) in the Southern Hemisphere.

October

6 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
7 Draconids Meteor Shower The Draconids is a minor meteor shower producing only about 10 meteors per hour. It is produced by dust grains left behind by comet 21P Giacobini-Zinner, The Draconids is an unusual shower in that the best viewing is in the early evening instead of early morning like most other showers. The shower runs annually from October 6-10 and peaks this year on the night of the 7th. This year, the nearly new moon will leave dark skies for what should be an excellent show. Best viewing will be in the early evening from a dark location far away from city lights. Meteors will radiate from the constellation Draco but can appear anywhere in the sky.
20 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Hunters Moon because at this time of year the leaves are falling, and the game is fat and ready to hunt. In Sri Lanka, its known as Vap Full moon.
21, 22 Orionids Meteor Shower The Orionids is an average shower producing up to 20 meteors per hour at its peak. It is produced by dust grains left behind by comet Halley, which has been known and observed since ancient times. The shower runs annually from October 2 to November 7. It peaks this year on the night of October 21 and the morning of October 22. Best viewing will be from a dark location after midnight. Meteors will radiate from the constellation Orion but can appear anywhere in the sky.
25 Mercury at Greatest Western Elongation The planet Mercury reaches greatest western elongation of 18.4 degrees from the Sun. This is the best time to view Mercury since it will be at its highest point above the horizon in the morning sky. Look for the planet low in the eastern sky just before sunrise.
29 Venus at Greatest Eastern Elongation The planet Venus reaches greatest eastern elongation of 47 degrees from the Sun. This is the best time to view Venus since it will be at its highest point above the horizon in the evening sky. Look for the bright planet in the western sky after sunset.

November

4 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
4, 5 Taurids Meteor Shower The Taurids is a long-running minor meteor shower producing only about 5-10 meteors per hour. It is unusual in that it consists of two separate streams. The first is produced by dust grains left behind by Asteroid 2004 TG10. The second stream is produced by debris left behind by Comet 2P Encke. The shower runs annually from September 7 to December 10. It peaks this year on the night of November 4. The new moon will leave dark skies this year for what should be an excellent show. Best viewing will be just after midnight from a dark location far away from city lights. Meteors will radiate from the constellation Taurus but can appear anywhere in the sky.
5 Uranus at Opposition The blue-green planet will be at its closest approach to Earth and its face will be fully illuminated by the Sun. It will be brighter than any other time of the year and will be visible all night long. This is the best time to view Uranus. Due to its distance, it will only appear as a tiny blue-green dot in all but the most powerful telescopes.
17, 18 Leonids Meteor Shower The Leonids is an average shower, producing up to 15 meteors per hour at its peak. This shower is unique in that it has a cyclonic peak about every 33 years where hundreds of meteors per hour can be seen. That last of these occurred in 2001. The Leonids is produced by dust grains left behind by comet Tempel-Tuttle. The shower runs annually from November 6-30. It peaks this year on the night of the 17th and morning of the 18th. Best viewing will be from a dark location after midnight. Meteors will radiate from the constellation Leo but can appear anywhere in the sky.
19 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes named this moon as the Beaver Moon because this was the time of year to set the beaver traps before the swamps and rivers froze. In Sri Lanka, its known as Il Full moon.
19 Partial Lunar Eclipse A partial lunar eclipse occurs when the Moon passes through the Earth's partial shadow, or penumbra, and only a portion of it passes through the darkest shadow, or umbra. During this type of eclipse, a part of the Moon will darken as it moves through the Earth's shadow. The eclipse will be visible throughout most of eastern Russia, Japan, the Pacific Ocean, North America, Mexico, Central America, and parts of western South America. (NASA Map and Eclipse Information) This will not be visible in Sri Lanka.

December

4 New Moon The Moon will be located on the same side of the Earth as the Sun and will not be visible in the night sky. This is the best time of the month to observe faint objects such as galaxies and star clusters because there is no moonlight to interfere.
4 Total Solar Eclipse A total solar eclipse occurs when the moon completely blocks the Sun, revealing the Sun's beautiful outer atmosphere known as the corona. The path of totality will for this eclipse will be limited to Antarctica and the southern Atlantic Ocean. A partial eclipse will be visible throughout much of South Africa. (NASA Map and Eclipse Information) (Interactive NASA Google) This will not be Visible in Sri Lanka.
13, 14 Geminids Meteor Shower The Geminids is the king of the meteor showers. It is considered by many to be the best shower in the heavens, producing up to 120 multicolored meteors per hour at its peak. It is produced by debris left behind by an asteroid known as 3200 Phaethon. The shower runs annually from December 7-17. It peaks this year on the night of the 13th and morning of the 14th. Best viewing will be from a dark location after midnight. Meteors will radiate from the constellation Gemini but can appear anywhere in the sky.
19 Full Moon The Moon will be located on the opposite side of the Earth as the Sun and its face will be fully illuminated. Native American tribes as the Cold Moon because this is the time of year when the cold winter air settles in and the nights become long and dark. In Sri Lanka, its known as Unduvap Full moon.
21 December Solstice The December solstice occurs at 15:50 UTC. The South Pole of the earth will be tilted toward the Sun, which will have reached its southernmost position in the sky and will be directly over the Tropic of Capricorn at 23.44 degrees south latitude. This is the first day of winter (winter solstice) in the Northern Hemisphere and the first day of summer (summer solstice) in the Southern Hemisphere.
21, 22 Ursids Meteor Shower The Ursids is a minor meteor shower producing about 5-10 meteors per hour. It is produced by dust grains left behind by comet Tuttle, which was first discovered in 1790. The shower runs annually from December 17-25. It peaks this year on the night of the 21st and morning of the 22nd. Best viewing will be just after midnight from a dark location far away from city lights. Meteors will radiate from the constellation Ursa Minor but can appear anywhere in the sky.

(Source - http://www.seasky.org/astronomy/astronomy-calendar-2021.html)
අවසන් යාවත්කාලීන කිරීම 2021 ජනවාරි 06 වෙනි බදාදා, 12:35  

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