Philip P. Ide

Author, programmer, science enthusiast, half-wit.
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blog:articles:info:lsubs [2020/06/06 19:45] Phil Ideblog:articles:info:lsubs [2020/06/07 12:06] (current) Phil Ide
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 The Martian clocks (keeping Martian time) on the [[:blog;aardvaark:mars_weather|Mars Weather]] page also display the L<html><sub>s</sub></html> (pron. ell sub ess) - a way of describing where the planet is in its orbit((Technically, the L<html><sub>s</sub></html> describes the position of the planet around the sun from the planet's perspective. L<html><sub>s</sub></html> is 0° at the vernal equinox (beginning of northern spring), 90° at summer solstice, 180° at autumnal equinox, and 270° at winter solstice)), and the displacement of the sun in the sky at midday. I noticed the value for this was out by some distance, and after pondering the problem (and the code) for a while, the penny dropped. The Martian clocks (keeping Martian time) on the [[:blog;aardvaark:mars_weather|Mars Weather]] page also display the L<html><sub>s</sub></html> (pron. ell sub ess) - a way of describing where the planet is in its orbit((Technically, the L<html><sub>s</sub></html> describes the position of the planet around the sun from the planet's perspective. L<html><sub>s</sub></html> is 0° at the vernal equinox (beginning of northern spring), 90° at summer solstice, 180° at autumnal equinox, and 270° at winter solstice)), and the displacement of the sun in the sky at midday. I noticed the value for this was out by some distance, and after pondering the problem (and the code) for a while, the penny dropped.
  
-Unfortunately, the code was still generating a value that was out by 1/100<sup>th</sup> of a degree, which isn't much but it bothered me. It turned out to be due to a rounding issue, so I fixed that. L<html><sub>s</sub></html> is now displayed to five decimal places for those that find this interesting or important. This value matches that generated by [[https://www.giss.nasa.gov/tools/mars24/|Mar24]], a program available from the [[https://www.giss.nasa.gov|Goddard Institute for Space Studies]], a branch of [[https://www.nasa.gov|NASA]].+Unfortunately, the code was still generating a value that was out by 1/100<sup>th</sup> of a degree, which isn't much but it bothered me. It turned out to be due to a rounding issue, so I fixed that. L<html><sub>s</sub></html> is now displayed to five decimal places. This value matches that generated by [[https://www.giss.nasa.gov/tools/mars24/|Mar24]], a program available from the [[https://www.giss.nasa.gov|Goddard Institute for Space Studies]], a branch of [[https://www.nasa.gov|NASA]].
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blog/articles/info/lsubs.1591472710.txt.gz · Last modified: 2020/06/06 19:45 by Phil Ide

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