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39 lines
1.3 KiB
Markdown
39 lines
1.3 KiB
Markdown
# astronomy
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## Time
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```python
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Time(self, ut)
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```
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Represents a date and time used for performing astronomy calculations.
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## Observer
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```python
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Observer(self, latitude, longitude, height=0)
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```
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Represents the geographic location of an observer on the surface of the Earth.
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:param latitude: Geographic latitude in degrees north of the equator.
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:param longitude: Geographic longitude in degrees east of the prime meridian at Greenwich, England.
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:param height: Elevation above sea level in meters.
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## GeoMoon
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```python
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GeoMoon(time)
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```
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Calculates the geocentric position of the Moon at a given time.
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Given a time of observation, calculates the Moon's position as a vector.
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The vector gives the location of the Moon's center relative to the Earth's center
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with x-, y-, and z-components measured in astronomical units.
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This algorithm is based on Nautical Almanac Office's <i>Improved Lunar Ephemeris</i> of 1954,
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which in turn derives from E. W. Brown's lunar theories from the early twentieth century.
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It is adapted from Turbo Pascal code from the book
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[Astronomy on the Personal Computer](https://www.springer.com/us/book/9783540672210)
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by Montenbruck and Pfleger.
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:param time: The date and time for which to calculate the Moon's position.
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:return The Moon's position as a vector in J2000 Cartesian equatorial coordinates.
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:rtype Vector
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