astronomy

I need to do some moonrise azimuth and time calculations. Can anyone recommend a good astronomy library, preferably in Objective-C? I recommend PJ Naughter's AA+ library . It is based on the Astronomical Algorithms book by Meeus. The library is quite comprehensive and written in C++ (easily called from Objective-C). My iOS app Lúan uses this library. Maybe code of opensource projects could fit you? Recently on FLOSS-Weekly was a discussion about Stellarium . Disclaimer: I didn't look at that source of Stellarium so I have no idea if it is useful at all and unfortunately it is written in C/C++.

I'm interested in doing a "Solar System" simulator that will allow me to simulate the rotational and gravitational forces of planets and stars. I'd like to be able to say, simulate our solar system, and simulate it across varying speeds (ie, watch Earth and other planets rotate around the sun across days, years, etc). I'd like to be able to add planets and change planets mass, etc, to see how it would effect the system. Does anyone have any resources that would point me in the right direction for writing this sort of simulator? Are there any existing physics engines which are designed for this

I'm writing several methods necessary to calculate the path of the Sun across a specific point. I have written the code using two different sources for my calculations and neither is producing the desired result. The sources are: http://www.pveducation.org/pvcdrom/properties-of-sunlight/suns-position and http://www.esrl.noaa.gov/gmd/grad/solcalc/solareqns.PDF Note: Degrees to arcminutes is Deg * 60 min. localSolartime: I have converted the longitude to 'minutes', the local standard time meridian(lstm) derived from the localStandardTimeMeridian method returns a value that is in 'minutes', and

I'm trying to write a basic python script that will track a given satellite, defined with tle's, from a given location. I'm not a asto/orbital person but am trying to become smarter on it. I am running into a problem when I try to convert the azimuth, elevation, range values to a ECEF position. I'm using PyEphem to get the observation values and spg4 to get the real location to verify. I'm also using the website, http://www.n2yo.com/?s=25544 , the verify the values. I'm getting the observed azimuth, elevation and range with: def get_ob(epoch, sv, obsLoc): site = ephem.Observer() site.lon = str

Long story short: I want to plot Gaia astrometry data to TESS imagery in Python. How is it possible? See below for elaborated version. I have 64x64 pixel TESS imagery of a star with Gaia ID 4687500098271761792 . Page 8 of the TESS Observatory Guide says 1 pixel is ~21 arcsec. Using the Gaia Archive , I search for this star (below top features , click Search .) and submit a query to see the stars within 1000 arcsec, roughly the radius we need. The name I use for the search is Gaia DR2 4687500098271761792 , as shown below: Submit Query, and I get a list of 500 stars with RA and DEC coordinates.