How to deduce the algorithm of constellation according to lunar calendar or solar calendar

The constellation is based on the solar calendar.

Aries: March 2 1

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April 20(th)

Taurus: April 2 1

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May 2 1

Gemini: May 22nd.

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June 2 1

Cancer: June 22

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July 22(nd)

Leo: July 23rd.

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August 23 rd

Virgo: August 24

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September 23(rd)

Libra: September 24

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65438+23 00 10 month

Scorpio: 65438+100 on October 24th.

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165438+1October 22nd

Sagittarius:165438+1October 23rd.

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65438+February 2 1

Capricorn: 65438+February 22nd.

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65438+1October 20th

Aquarius: 65438+1October 2 1.

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February 65438, 2009

Pisces: February 20

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March 20