2021, January 14: Brilliant Morning Star Venus

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2021, January 14: Thirty minutes before sunrise, Venus is low in the east-southeast.

January 14, 2021:  Venus is slowly disappearing from the morning sky.  It is low in the southeast during bright morning twilight.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 7:16 a.m. CST; Sunset, 4:44 p.m. CST.  Check local sources for sunrise and sunset times for your location.

Brilliant Venus rises later each morning.  It is losing about 2 minutes of rising time each morning compared to the sun.  The result is that it appears lower in the sky.  Venus is less than 5° in altitude in the southeast at 30 minutes before sunrise.

This morning Venus rises at Nautical Twilight, a little over an hour before sunrise.  This occurs when the sun is 12° below the horizon.  The sky is fairly dark, but there is some illumination from the sun in the eastern sky.  At this time, “only general outlines of ground objects are distinguishable; for navigation purposes, the horizon is barely visible,” according to the U.S. Naval Observatory.

Venus is becoming more difficult to see.  It may be visible at this time interval (30 minutes) before sunrise until January 20 without optical aid. Afterwards, a binocular may be necessary.

Venus passes Saturn and Jupiter next month during the daytime.  The conjunctions are easily observable with a small telescope.

Venus does not pass fully into the sun’s brilliant light until March 26. Afterwards, it appears in the evening sky later in the year.

Read about Venus during January.

Detailed Note: Venus rises before Nautical Twilight, 64 minutes before sunrise. It is less than 5° in altitude in the southeast at 30 minutes before sunrise.  Depending on the weather and the view from your location, Venus may be visible low in the southeast until January 20 (or later) without optical assistance at about 30 minutes before sunrise.  What is the last date that you see the planet without a binocular or telescope before sunrise? Venus does not reach its superior conjunction until March 26.

Read more about the planets during January.

2021, April 18: Crescent Moon, Mars, Evening Sky

April 18, 2021:  The crescent moon is high in the west after sunset among the stars of Gemini, below Pollux and Castor.  Mars is above the Bull’s horns.  Daylight is 13 hours, 30 minutes long.

2021, April 18: Jupiter, Saturn, Morning Planets

April 18, 2021: The bright morning planets, Jupiter and Saturn, are in the southeastern sky before sunrise.  Capricornus is the starry background for this giant planet duo.  Daylight is 13 hours, 30 minutes long.



Categories: Astronomy, Sky Watching

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