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35 lines
1.3 KiB
Python
Executable File
35 lines
1.3 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# culminate.py - Don Cross - 2019-08-10
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#
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# Example program for Astronomy Engine:
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# https://github.com/cosinekitty/astronomy
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#
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# This example program shows how to calculate the time
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# the Sun, Moon, and planets will next reach their highest point in the sky
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# as seen by an observer at a given location on the Earth.
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# This is called culmination, and is found by finding when
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# each body's "hour angle" is 0.
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#
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# Having an hour angle of 0 is another way of saying that the body is
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# crossing the meridian, the imaginary semicircle in the sky that passes
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# from due north on the horizon, through the zenith (straight up),
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# toward due south on the horizon. At this moment the body appears to
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# have an azimuth of either 180 degrees (due south) or 0 (due north).
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import sys
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from astronomy import Body, SearchHourAngle
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from astro_demo_common import ParseArgs
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if __name__ == '__main__':
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observer, time = ParseArgs(sys.argv)
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body_list = [
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Body.Sun, Body.Moon, Body.Mercury, Body.Venus, Body.Mars,
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Body.Jupiter, Body.Saturn, Body.Uranus, Body.Neptune, Body.Pluto
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]
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print('search :', time)
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for body in body_list:
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evt = SearchHourAngle(body, observer, 0.0, time)
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print('{:<8s} : {} altitude={:6.2f} azimuth={:7.2f}'.format(body.name, evt.time, evt.hor.altitude, evt.hor.azimuth))
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sys.exit(0)
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