2021, March 20: Vernal Equinox, Morning Planets

Advertisements
2021, March 20: Forty-five minutes before sunrise Jupiter and Saturn are low in the southeast. They are 10.4° apart.

March 20, 2021: The Vernal Equinox occurs at 4:37 a.m. CDT.  The sun’s light is most directed at the equator.  During the next six months, sunlight is more direct in the earth’s northern hemisphere.

by Jeffrey L. Hunt

Chicago, Illinois:  Sunrise, 6:54 a.m. CDT; Sunset, 7:03 p.m. CDT.  Check local sources for sunrise and sunset times for your location.

The Vernal Equinox occurs at 4:37 a.m. CDT.  The sun reaches the celestial coordinates 0° longitude, 0° latitude.

If you notice the sunrise and sunset times, daylight is already 9 minutes longer than half of a day.

The sun’s light is most direct at the equator.  At this hemisphere-dividing line, the sun passes overhead at noon.  Shadows are shortest.  They do not disappear.  One could seek refuge from the sun’s intensity under a tree or the awning of a porch.

After today, the sun’s daily intensity is directed farther northward with lengthening daylight until June 20.

Before sunrise, Jupiter and Saturn are in the southeastern sky.  About 45 minutes before sunrise.  Saturn is about 11° up in the southeast.  Jupiter – about 7° above the east-southeast horizon – is 10.4° to the lower left of the Ringed Wonder. 

Detailed Note: The sun is at 0° of ecliptic longitude at 4:37 a.m. CDT, signaling the beginning of astronomical spring (Vernal Equinox) in the northern hemisphere. During mid-twilight, about 45 minutes before sunrise, Jupiter and Saturn are low in the southeastern sky.  Saturn is 11° up in the southeast.  Jupiter is 10.4° of ecliptic longitude east of Saturn.  The Giant Planet is nearly 7° up in the east-southeast, 3.0° to the lower left of ι Cap, while Saturn is 3.7° to the upper right of θ Cap. An hour after sunset, the moon (7.6d, 44%) – between the horns of Taurus – is over two-thirds of the way up in the southwest.  It is 3.0° to the upper right of Zeta Tauri (ζ Tau, m = 2.0) and 4.8° to the lower right of Elnath (“the one butting with horns,” β Tau, m =1.6).  Mars is over 14° to the lower right of the thick lunar crescent. This evening, Mars passes 6.9° to the upper right of Aldebaran.  The planet is nearly 10° to the upper left of Alcyone and the Pleiades. Among the dimmer stars, the Red Planet is 2.6° to the lower right of τ Tau. 

Read more about the planets during March 2021.

2021, July 26: Evening Sky, Mars Closes In

July 26, 2021:  Four bright planets are in the evening sky.  Mars closes in on Regulus for their conjunction in three evenings.  Brilliant Evening Star Venus appears to the upper left of the impending Mars – Regulus conjunction.  Saturn and Jupiter are low in the southeastern sky after sunset.

2021, July 25: Evening Sky, Mars on Final Approach

July 25, 2021:  Four evenings before its conjunction with Regulus, find Mars in the western sky to the lower right of Venus.  As the calendar day ends, look for the moon below bright Jupiter.

2021, July 24: Four Evening Planets, Moon

July 24, 2021: After sunset, Venus and Mars are in the western sky.  A little later during evening hours, the moon is near Jupiter and Saturn in the southeast.

2021, July 29: Jupiter – Mars Opposition

July 29, 2021:  Jupiter and Mars are 180° apart along the ecliptic.  Dim Mars sets in the west-northwest as Jupiter rises in the east-southeast.  This event signals that soon both appear in the sky simultaneously.



Categories: Astronomy, Sky Watching

Tags: , , , ,

Leave a Reply

%%footer%%