pyephem

Wrong Range Rate with Pyephem

由 别等时光非礼了梦想. 提交于 2019-12-10 21:41:02
问题 I am trying to calculate a satellites Range Rate using Python and pyephem. Unfortunately pyephems result seems to be wrong. After comparing the value with calculations made by other satellite tracking programs like GPredict or Ham Radio Deluxe the the difference goes up to 2km/sec.The calculated values for the Azemuth and Elevation ankle are almost the same thought. TLE's are new and the system clock is the same. Do you see any mistake I made in my code or do you have an idea what else could

Installing Ephem package in Python 3

由 夙愿已清 提交于 2019-12-10 18:56:48
问题 I would like to install the ephem package in my Python 3.3.0 version under Windows XP. I tried first the pip install ephem route from the system command prompt. The process aborted with the error message of Unable to find vcvarsall.bat . I read prior advice on the net for such a difficulty. Following it I installed mingw32 in my computer, added C:\MinGW\bin to the PATH variable and provided Lib / distutils with a new file called distutils.cfg and the content: [build] compiler=mingw32 On

How to get earth-inertial or earth-centered coordinates of objects from PyEphem?

由 南楼画角 提交于 2019-12-10 18:38:57
问题 I would like to get coordinates of objects in various XYZ coordinates, not where they appear in the sky. I'm interested in: ECE: "Earth Centered Inertial" (not rotation with the earth) ECEF: "Earth Centered Earth-Fixed" (not inertial, also called "Earth Centered Rotational" and some kind of solar system or ecliptic coordinates (sun or barycenter centered). I've installed PyEphem, run a few examples, and have started to understand what's under the hood, but so far the examples I've found seem

PyEphem under the hood - how does it calculate position of planets?

由 喜夏-厌秋 提交于 2019-12-10 17:55:40
问题 In space SE it was suggested I use PyEphem to calculate orbits from two-line elements. Now I'm curious how it calculates "build-in" solar system objects like the planets and their satellites. Does it use one of the standard JPL ephemerides (also here), or something else? So far I couldn't find out looking at the PyEphem or XEphem websites. For example the JPL ephemerides are generated (loosely speaking) by integrating orbits over a limited period of time while comparing to a large body of

How to compute (alt, az) for given Galactic coordinate (GLON, GLAT) with PyEphem?

由 一个人想着一个人 提交于 2019-12-10 17:44:11
问题 For a given observer (lon, lat, time) on Earth and a given Galactic coordinate (GLON, GLAT), how can I compute the corresponding (alt, az) point in the sky with PyEphem? 回答1: Given the way that PyEphem currently works, there are two steps to answering your question. First, you have to convert a pair of galactic coordinates into an equatorial RA/dec pair of coordinates instead. import ephem # Convert a Galactic coordinate to RA and dec galactic_center = ephem.Galactic(0, 0) eq = ephem

import error: ephem/_libastro.so undefined symbol: PyUnicodeUCS2_AsUTF8String

由 对着背影说爱祢 提交于 2019-12-10 16:56:32
问题 I just successfully installed PyEphem using pip in a pyenv. However, on import I receive: ImportError: /python2.7/site-packages/ephem/_libastro.so: undefined symbol: PyUnicodeUCS2_AsUTF8String In looking around I've seen it mentioned that some modules are built "against Python" in regards to Unicode and suggest recompiling. I'm quite new to Python and Ubuntu 14.04, and although I believe this is the answer to my issue, I do not know what recompiling means or how to do it. 回答1: The symbol

Results for Observer() seemingly not accounting for elevation effects in PyEphem

由 若如初见. 提交于 2019-12-10 02:41:50
问题 I've a query on the results given by the PyEphem module relating to Observer() queries, and the effects of elevation. I understand from a couple of sources (such as http://curious.astro.cornell.edu/question.php?number=388) that the elevation of the observer has a marked effect on sunset time. However in the following code, I see next to no difference: import ephem emphemObj = ephem.Observer() emphemObj.date = '2011/08/09' emphemObj.lat = '53.4167' emphemObj.long = '-3' emphemObj.elevation = 0

Swiss Ephemeris Sideral Mode with Lahiri Ayanamsha gives wrong values

由 醉酒当歌 提交于 2019-12-10 00:21:41
问题 I'm trying to generate the longitudes of planets. I've used the swiss ephemeris dll to do all my hard work. However to my misfortune the values generated by swiss ephemeris for the sidereal mode Lahiri Ayanamsha is way off (by around 25 minutes, especially for moon) from what I'm getting out of other vedic software or online portals including JuniorJyothsh I've downloaded the .se1 files(for planets and moon) and am using the very accurate Swiss Ephemeris mode. Further I've set the Sidereal

Python PyEphem calculation of Azimuth and Altitude

由 主宰稳场 提交于 2019-12-07 07:28:49
问题 I am new to PyEphem and I am trying to figure out what it can do and how it works. As I do not want to use it as a black box and blindly trust whatever figure I get, I wanted to recreate an example that is explained here. The example calculates the azimuth and altitude of an object for a given observer on the 10th August 1998 at 23:10 UT. The following parameters are given: RA = 16 h 41.7 min, DEC = 36 d 28 min The observer's latitude is 52 d 30 min North and longitude 1 d 55 min West. The

Pyephem calculate current solar time

由 爱⌒轻易说出口 提交于 2019-12-06 15:01:06
I am trying to calculate the local solar time based on UTC hour and longitude. I have looked through the ephem package but was not able to identify a direct method to do so. Similar questions on this matter either evoke the calculation of fixed positions (sunrise, moon, sunset) (e.g. Calculating dawn and sunset times using PyEphem ) or receive suggestions of simplified methods (e.g. Local solar time function from UTC and longitude ). Is there any alternative to the aforementioned solutions? Thanks in advance To compute local solar time, I think that you can just ask for the current right
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