All Questions
Tagged with astronomy date-and-time
13
questions
4
votes
1
answer
84
views
StarData, Altitude/Azimuth Anomaly with TimeZones
I am trying to compute lunar parallax using the position of the star Regulus on February 19th of this year. I get different answers depending on how I specify the date.
Here are the particulars:
<...
- 906
6
votes
1
answer
161
views
Does SolarEclipse only cover a limited date range?
If I use the example from the documentation for SolarEclipse and simply replace the years there with older ones, say from around Shakespeare's time,
...
- 12.9k
1
vote
1
answer
319
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 ...
- 3,726
6
votes
1
answer
210
views
TimeZone Anomaly
I ran into the following situation when I was trying to determine the time of sunrise (using the built-in Sunrise function) for a variable location on a variable ...
- 906
14
votes
3
answers
580
views
Calculate moonrise
Mathematica has Sunrise[], but no Moonrise[]. But it has MoonPosition[], so I thought it ...
- 547
10
votes
1
answer
670
views
Plotting how sunrise times change over the year
I created a somewhat lengthy Python code to show how the time of sunrise varies over a year, resulting in the following figure (daylight savings were disregarded):
The dataset can be found here. The ...
- 203
4
votes
0
answers
201
views
Predicting Manhattanhenge
At the time of writing, Manhattanhenge is tonight in New York City (ref 1), "an event during which the setting sun is aligned with the east–west streets of the main street grid of Manhattan, New York ...
- 387
3
votes
1
answer
171
views
38
votes
2
answers
4k
views
The Orbit and Perigee of the Flamsteed comet
Historical context
This year we have the 330-th anniversary of the Battle of Vienna - one of the great formative events of European history, it took place on September 12, 1683.
Kara Mustafa, Grand ...
- 57.6k
13
votes
2
answers
488
views
How is AstronomicalData interpreting its date arguments?
It is easy to confirm that the AstronomicalData is not interpreting its arguments as UTC (or "GMT", which is, in any case, ambiguous) dates by verifying that the ...
- 12.9k
19
votes
1
answer
641
views
Is there a way to get AbsoluteTime to correctly report absolute time differences?
AbsoluteTime supposedly reports the "total number of seconds" between two dates, but it does not. For example, because of the leap second applied at 2012-...
- 12.9k
10
votes
1
answer
413
views
How do I determine astronomical transit times?
Mathematica, through the "legacy" Scientific Astronomer package, used to have the ability to easily determine accurate transit times of astronomical objects simply, with ...
- 12.9k
15
votes
3
answers
4k
views
How do I compute sidereal time and JD?
There was once a package that provided a wide range of functions for computing astronomical information. This package now appears to be out of date; but as near as I can tell, many of the useful ...
- 12.9k