Seasons

Seasons

Algorithms

Calculates the starting dates of the seasons

function StartSeason(year: Integer; season:TSeason): TDateTime;

Description

Calculates the starting dates of the four seasons, or to be more exact the astronomical event which is used as the season start - that is: the position of the sun has a longitude divisible by 90°.

Hint

The Chinese calendar is separating the year by 24 times called solar terms, the beginning of the seasons are just four of those.

Reference

This function is based upon chapter 27 (26) of "Astronomical Algorithms".