Almanac data for 2013

Comparisons with the 2013 Nautical Almanac Commercial Edition show that our spreadsheets remain sufficiently accurate for the year 2013 without the need for any changes or updates.




Later in the year the Venus spreadsheet develops a difference of 0.4′ in its GHA value compared to the published almanac.  This is still within the limits of acceptability for practical celestial navigation.



(first published on September 29, 2012)

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