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↑Van Flandern, T.; K. Pulkkinen (1980). "Low precision formulae for planetary positions". Astrophysical Journal, Supplement Series31 (3). DOI:
10.1086/190623.
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{{Information |Description ={{en|1=The three types of twilight and their measurements. The Sun is drawn to scale (with a diameter of 32 arcminutes).}} |Source ={{own}} |Author =
TWCarlson |Date =2012-09-07...
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