Sun and Zodiac Signs - exact Dates of 2021:
Visible Movement of the Sun in the Constellations and Zodiac

Google translator 2021, original text: Sun and Zodiac Signs - exact Dates of 2021 (Russian)

Contents:

• Sun and Zodiac Signs of 2021
• Sun and the zodiac Constellations in 2021
• The Culmination of the zodiacal Constellations in 2021
• Sun, zodiac constellations and zodiac signs summary table

 

Sun and Zodiac Signs of 2021

Moments of transition of the Sun from one zodiac sign to another is determined by the time of alignment of the geometric center of the luminary with the ecliptic longitude multiple of 30 °.
These dates do not agree with the earth's daily cycle and change from year to year, due to the fact that the duration of the astronomical year is not equal to a whole number of days (365.256 days), as well as the fact that the Earth and the Moon, when rotating around the Sun, represent a binary system, the center whose mass does not coincide with the center of the Earth.

To determine the moments of these events, a table has been compiled, which gives their exact date * - the date, month and time of the Sun's entry into the zodiac signs for 2021.
 

Table 1. Dates of the transition of the Sun between the signs of the zodiac in 2021 (UTC):

                          

Date	Sun and zodiac signs 2021
19 January 2021 20:40	The sun enters the sign of Aquarius
18 February 2021 10:44	The sun enters the sign of Pisces
20 March 2021 09:37	Sun enters Aries Vernal equinox
19 April 2021 20:33	The sun enters the sign of Taurus
20 May 2021 19:37	The sun enters the sign of Gemini
June 21, 2021 03:32	Sun Enters Cancer Summer Solstice
22 July 2021 14:26	The sun enters the sign of Leo
22 August 2021 21:35	The sun enters the sign of Virgo
22 September 2021 19:21	Sun Enters Libra Autumn Equinox
23 October 2021 04:51	The sun enters the sign of Scorpio
22 November 2021 02:33	The sun enters the sign of Sagittarius
December 21, 2021 15:59	Sun Enters Capricorn Sign Winter Solstice

Sun and the zodiac Constellations in 2021

Until the final approval of the constellation boundaries by the International Astronomical Union at the 1935 General Assembly, the table presented on this page simply could not exist, because previously the constellations did not have clearly defined boundaries
 

Table 2. Dates when the Sun crosses the boundaries of constellations zodiac belt in 2021 (UTC):

                            

Date	Sun and constellations 2021
19 January 2021 19:15	Sun enters the constellation Capricornus
16 February 2021 05:40	The sun enters the constellation Aquarius
12 March 2021 07:20	The sun enters the constellation Pisces
18 April 2021 19:25	The sun enters the constellation Aries
14 May 2021 06:55	The sun enters the constellation Taurus
21 June 2021 14:25	The sun enters the constellation Gemini
20 July 2021 19:15	Sun enters the constellation Cancer
10 August 2021 18:20	The sun enters the constellation Leo
16 September 2021 19:15	The sun enters the constellation Virgo
31 October 2021 07:35	The sun enters the constellation Libra
23 November 2021 09:25	The sun enters the constellation Scorpius
29 November 2021 22:40	The sun enters the constellation Ophiuchus
18 December 2021 06:20	The sun enters the constellation Sagittarius

This page is in addition to the main article: Sun: occurrences of the zodiac, solstice, equinox - exact dates 2000-2021 (Russian)

 

he Culmination of the zodiacal Constellations in 2021

The zodiac constellations are by no means lined up along the ecliptic in a strict line, therefore, two constellations can often fall into the culmination area, therefore, two dates are given in the table - the start and end dates of the culmination of each constellation..
 

Table 3. Dates of the culmination of the zodiacal constellations in 2021

                                                                                                                                                                                                     

Start	Completion	The culmination of the zodiac constellations
December 23, 2020	January 24, 2021	The culmination of the constellation Gemini
January 20, 2021	February 12, 2021	The culmination of the constellation Cancer
February 13, 2021	March 22nd    2021	The culmination of the constellation Leo
March 18th    2021	May 10    2021	The culmination of the constellation Virgo
April 27, 2021	May 23    2021	The climax of the constellation Libra
May 18    2021	June 21st    2021	The culmination of the constellation Scorpius
June 18th 2021	July 30th    2021	The culmination of the constellation Sagittarius
July 25th    2021	August 21, 2021	The climax of the constellation Capricornus
August 02, 2021	September 21, 2021	The culmination of the constellation Aquarius
September 04, 2021	October 23, 2021	The culmination of the constellation Pisces
October 19, 2021	November 14, 2021	The culmination of the constellation Aries
November 12, 2021	December 22, 2021	The culmination of the constellation Taurus
December 22, 2021	January 23, 2022	The culmination of the constellation Gemini

 

Sun, zodiac constellations and zodiac signs summary table

It is necessary to distinguish between the concepts of the stay of the Sun in the Signs of the zodiac and its stay in the same zodiac constellations - this is far from the same thing.

Zodiac signs - this is just a well-established since ancient times, the designation of conditional 30° sectors of the celestial sphere (All the mystery of such a division of the celestial sphere would be lost if the sector would just be numbered. Imagine: instead of dialogue: - "What sign were you born under?" - " lion", - would sound: " In what sector was the Sun at the time of Your birth?" - " in the fifth!":) .

Constellations, on the other hand, are certain sections of the celestial sphere whose boundaries are now clearly defined, agreed upon and accepted as the basis for orientation by the celestial sphere by astronomers of the whole world. The time of the observed passage of the sun, within the boundaries of a particular constellation, is called the time it was in the constellation. The boundaries of the zodiac constellations and zodiac sectors do not coincide at all (although at the beginning of our era, 2000 years ago, they were close to each other). In the table below, the average dates of the Sun's stay in the zodiac sectors (zodiac signs) and zodiac constellations are presented.

Table 4. Signs of the zodiac, their designations, periods of passage by the sun of the zodiac sectors and zodiac constellations

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 

Aries		Aries Sun March 21 - April 20	Sun in the constellation Aries, April 18 - May 14
Taurus		The sun in Taurus, April 21 - May 21	Sun in the constellation Taurus, May 14 - June 21
Twins		Sun in the sign of Gemini,               May 22 - June 21	Sun in the constellation Gemini, June 21 - July 20
Cancer		Sun in Cancer,               June 22 - July 22	Sun in the constellation Cancer,               July 20 - August 11
Leo		Sun in the sign of Leo, July 23 - August 23	Sun in the constellation Leo,               August 11 — September 17
Virgo		Sun in the sign of Virgo, August 24 — September 22	Sun in the constellation Virgo,               September 17 — October 31
Scales		Sun in Libra, September 23 - October 22	Sun in the constellation Libra, October 31 - November 22
Scorpio		Sun in the sign Scorpio,             October 23 - November 22	Sun in the constellation Scorpio, November 22 - November 30
Sagittarius		Sun in the sign of Sagittarius,               November 23 — December 21	Sun in the constellation Sagittarius, December 18 - January 19
Capricorn		Sun in the sign Capricorn, December 22 - January 20	Sun in the constellation Capricorn, January 19 - February 16
Aquarius		Sun in the sign of Aquarius, January 21 - February 19	Sun in the constellation Aquarius, February 16 - March 12
Fish		Sun in the sign of Pisces, February 20 - March 20	Sun in the constellation Pisces, March 12 - April 18

 

* Modern official astronomy has long ceased to be involved in calculating the visual movement of the Sun across the zodiac sectors, so I believe that the accuracy of the interpolation formulas I have chosen is ± 2-3 minutes.