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GHA Aries Long Term for the years 2017 to 2025 has just been added to our site.

You'll find it under Essential Celestial Navigation downloads

The file is- Table 4 GHA ARIES FOR THE YEARS 2017-2025

The previous Table 4 GHA ARIES, etc....was for the years 2011 to 2019.

Let me know how you like it or any changes you'd suggest.

Clear skies,

CelNav57

How is the month and year figure determined in "part a" ?

Good question- I think its the GHA ♈ of the first day of each month at GMT 00:00:00.

You are correct. "part a" uses the GHA of ♈ at GMT 00:00:00 for first day of the respective months.