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1 answer
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Constructing Wolfram Alpha Query for Solar Position

When I use Mathematica calls to WolframAlpha, it clearly knows about the motion of the sun, so I can request the solar declination at any date/time: But I'm having great difficulty crafting a query ...
Michael's user avatar
  • 53
1 vote
1 answer
324 views

list of dates for vernal equinox

I'm trying to get a list of dates and times of the vernal equinox for the last 30 years (or some other time interval). I'm flailing about and really have gotten nowhere. When I've tried typing ...
Mitchell Kaplan's user avatar
9 votes
3 answers
857 views

Problems getting clean sunrise, sunset, civil, nautical and astronomical twilight data

If in a notebook you enter: ...
George Wolfe's user avatar
  • 5,482