The solar altitude angle of Xi Xiaoxue solar term

In this way, the solar meridian of each solar term is 15 more than that of the previous solar term, while the solar meridian of the vernal equinox is 0, so the solar meridian of Qingming is 15. By analogy, the relationship between the solar declination (which can be understood as where the direct point of the sun is, the solar declination in the northern hemisphere is+and the solar declination in the southern hemisphere is-) and the solar meridian is SIN δ =. For example, when the longitude of the sun is 3 15 in beginning of spring, then sin δ = sin2326'16 ÷ * sin315, then δ=- 16 20' 6. 18÷ that is.

Beginning of spring s 16 20' 6. 18 "

Rainwater s1128'16.55 "

sting S5 54 ' 3 1.83 "

The vernal equinox is 0 0' 0 "

Qingming N5 54' 3 1.83 "

Grain Rain n1128'16.55 "

Changxia n 16 20' 6. 18 "

Small size N20 8' 56.72 "

Mango N22 35' 38.66 "

Summer Solstice N23 26' 16 "

Slight heat N22 35' 38.66 "

Summer N20°8' 56.72 "

Beginning of autumn n 16 20'6. 18 "

Summer high temperature n1128'16.55 "

Millennium n5 54'3 1.83 "

Autumnal Equinox 0 0' 0 "

Cold dew S5 54'3 1.83 "

The first frost s1128'16.55 "

Beginning of winter s 16 20' 6. 18 "

Xiaoxue S20 8' 56.72 "

Heavy snow s22 35' 38.66 "

Winter solstice S23 26' 16 "

Slight cold s22 35'38.66 "

Great cold S20 8' 56.72 "