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58 lines
1.7 KiB
Python
Executable File
58 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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#
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# lunar_eclipse.py - by Don Cross - 2020-05-16
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#
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# Example Python program for Astronomy Engine:
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# https://github.com/cosinekitty/astronomy
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#
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# Searches for the next 10 partial/total lunar eclipses after
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# the current date, or a date specified on the command line.
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#
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# To execute, run the command:
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# python3 lunar_eclipse.py [date]
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#
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import sys
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from astronomy import Time, SearchLunarEclipse, NextLunarEclipse, EclipseKind
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def PrintEclipse(e):
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# Calculate beginning/ending of different phases
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# of an eclipse by subtracting/adding the peak time
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# with the number of minutes indicated by the "semi-duration"
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# fields sd_partial and sd_total.
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MINUTES_PER_DAY = 24 * 60
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p1 = e.peak.AddDays(-e.sd_partial / MINUTES_PER_DAY)
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print('{} Partial eclipse begins.'.format(p1))
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if e.sd_total > 0.0:
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t1 = e.peak.AddDays(-e.sd_total / MINUTES_PER_DAY)
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print('{} Total eclipse begins.'.format(t1))
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print('{} Peak of {} eclipse.'.format(e.peak, e.kind.name.lower()))
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if e.sd_total > 0.0:
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t2 = e.peak.AddDays(+e.sd_total / MINUTES_PER_DAY)
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print('{} Total eclipse ends.'.format(t2))
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p2 = e.peak.AddDays(+e.sd_partial / MINUTES_PER_DAY)
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print('{} Partial eclipse ends.'.format(p2))
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print()
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def main(args):
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if len(args) == 1:
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time = Time.Now()
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elif len(args) == 2:
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time = Time.Parse(args[1])
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else:
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print('USAGE: {} [yyyy-mm-ddThh:mm:ssZ]'.format(args[0]))
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return 1
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count = 0
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e = SearchLunarEclipse(time)
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while count < 10:
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if e.kind != EclipseKind.Penumbral:
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count += 1
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PrintEclipse(e)
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e = NextLunarEclipse(e.peak)
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if __name__ == '__main__':
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sys.exit(main(sys.argv))
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