The results of most commands of ASTRO depend on the observer's location on
Earth 1. This information is input via the
OBSERVATORY command. You should type:
OBSERVATORY longitude latitude altitude
where the longitude and latitude are in degrees and the altitude in kilometers.
You may also type
OBSERVATORY name
Known names are ``BURE'', ``VELETA'', ``KITT_PEAK'',
``VLA'', ``MAUNA_KEA'' and ``LASILLA''.
You will have to reset the time if you change the observatory.