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====Eise planet map====

{{ fotos:astro:eise001.jpg?200}} In the city you do not see the night
sky very well. Only the brightest stars are visible. And because you
do not see the whole sky from between the buildings you have little
reference to know what you are looking at. To know where the planets
are in the sky a map would be handy. Using a raspberry pi, an e-ink
display and the impressive [[https://rhodesmill.org/skyfield/|skyfield
python library]] is made a small map which updates automatically.
{{fotos:astro:eise003.jpg?200 }}

Every fifteen minutes cron starts a sall python script which computes
where in the sky the planets are, seen from my Amsterdam location. It
then plots plots the planet symbols on the map of the sky. It computes
the next rise time of the planets which are under the horizon and
lists those planets, with the next rise time, on the left side of the
map. At the bottom of the screen are the cardinal directions in red:
east (o=oost), south (z=zuid) and w for west. On the right side the
time for which the is computed is shown and the illuminated part of
the Moon (☾) and Venus (♀) in percent. For the planet symbols i used
the [[https://www.ctan.org/tex-archive/fonts/cmastro|TeX cmastro]]
metafont.  I call it **eise** after the builder of
[[https://www.planetarium-friesland.nl/|the most beautiful planetarium
in the world]].

{{tag> en:digital en:space en:astronomy en:map}}