Changes in the Sun's Right Ascension and Declination in 2017

Counting from the 2016 winter solstice:

Winter Solstice  lat:-23.4345373662015 lng:269.999994655047
Minor Cold  lat:-22.5911813587045 lng:286.279828913395
Major Cold  lat:-20.146398730878 lng:302.180342232811
Start of Spring  lat:-16.3332487161178 lng:317.463224776918
Rain Water  lat:-11.4699901274027 lng:332.088158058519
Awakening of Insects  lat:-5.90839675213845 lng:346.188040355
Spring Equinox  lat:3.75087129432163E-05 lng:359.999975893782
Clear and Bright  lat:5.90806928523707 lng:13.8124169904995
Grain Rain  lat:11.4698920399016 lng:27.9114798603294
Start of Summer  lat:16.33295380766 lng:42.5368247544295
Lesser Fullness  lat:20.1463302430029 lng:57.8196140811093
Grain in Ear  lat:22.5911391776784 lng:73.7200918186321
Summer Solstice  lat:23.4344365184489 lng:89.9999796825033
Minor Heat  lat:22.5911960947669 lng:106.279844168781
Major Heat  lat:20.1464120282855 lng:122.180380266707
Start of Autumn  lat:16.3331066998753 lng:137.463281323833
End of Heat  lat:11.4700203044901 lng:152.088742552706
White Dew  lat:5.90813672115571 lng:166.187968077498
Autumn Equinox  lat:0.000186701723948384 lng:180.000090219358
Cold Dew  lat:-5.90827694123578 lng:193.81201182319
Frost Descent  lat:-11.4697641058036 lng:207.911400043448
Start of Winter  lat:-16.3331834679937 lng:222.536745630485
Lesser Snow  lat:-20.1466018545255 lng:237.820255794278
Major Snow  lat:-22.5912636542023 lng:253.720243266812

It is clearly visible that between the spring equinox and autumn equinox there is an obvious boundary point: after the spring equinox the Sun's declination is positive, while from after the autumn equinox to the spring equinox it is all negative—this accords with the saying that mao and you are the gates through which sun and moon enter and exit, and the coming and going of cold and heat. At the same time one can see that the summer solstice is the highest point and the winter solstice the lowest—this accords with the zi-wu division, also the turning point of yang-to-yin and yin-to-yang. Thus the Chinese astronomical-numerological system is constructed using the equatorial coordinate system. If one switches to the ecliptic and looks at ecliptic latitude, the fluctuations are rather violent and difficult to describe with a simple numerological model.

Winter Solstice  lat:2.62186718349146E-05 lng:269.999995095925
Minor Cold  lat:-0.000163828911347849 lng:284.999996216495
Major Cold  lat:4.86608625603751E-05 lng:299.999999722661
Start of Spring  lat:-0.000249573826898748 lng:314.999954303572
Rain Water  lat:6.6875606899939E-05 lng:329.999511595939
Awakening of Insects  lat:-0.000267512970002093 lng:344.999998007862
Spring Equinox  lat:4.40019232958761E-05 lng:359.99999279972
Clear and Bright  lat:-0.000216339484779312 lng:15.0002951425806
Grain Rain  lat:-5.42618083039389E-05 lng:30.0001217178393
Start of Summer  lat:-0.000101860602828188 lng:45.0000047203505
Lesser Fullness  lat:-0.000195411759770531 lng:59.9999456880914
Grain in Ear  lat:2.06380479680582E-05 lng:74.9999263514346
Summer Solstice  lat:-0.000250965283501872 lng:89.9999813583765
Minor Heat  lat:7.18131485741962E-05 lng:105.000008570569
Major Heat  lat:-0.000133997377611935 lng:120.000031802858
Start of Autumn  lat:2.57291864682707E-05 lng:135.000047803234
End of Heat  lat:6.73598298955069E-05 lng:150.000037271115
White Dew  lat:-5.49982103704734E-05 lng:165.000032118116
Autumn Equinox  lat:0.000207182062473057 lng:180.000008524043
Cold Dew  lat:-7.84204101624421E-05 lng:195.000003594926
Frost Descent  lat:0.000239625483846269 lng:210.000003522851
Start of Winter  lat:-3.1861144181299E-05 lng:224.999999424477
Lesser Snow  lat:0.000192019240959902 lng:240.000591999021
Major Snow  lat:3.6834358374498E-05 lng:255.00007918482

The regularity of the Sun's ecliptic latitude is not obvious, so if one uses the Sun's palace transitions, problems will inevitably arise regarding the latitude aspect. In Da Liu Ren, it is usually held that the Monthly General is the ecliptic Sun's palace transition; since the Monthly General's motion does not consider the issue of fluctuations, and in longitude right ascension and ecliptic longitude usually do not differ greatly, even when there is some error it is generally ignored.