show source, [utc=?, horizon=?]
Display contemporary information about a source.
Source source
Date utc
Elevation horizon
show moonAn example of the possible output is:
Source: moon (31-JAN-1999 23:57:19 UTC) AZ: 55:14:50.329 EL: -19:30:22.728 PA: -44:43:35.743 RA: 9:14:47.196 DEC: 14:54:40.407 Currently below the 43 degree horizon (rising). Next rises in 5.5 hours, and sets in 11.9 hours.Note that the 43 degree horizon that is shown here implies that prior to this command, eg. in the initialization file, the following command was invoked.
horizon 43To override this temporarily, for example to see when the sun is going to set, you could use the optional horizon argument of the show command, as follows:
show sun, horizon=0Similarly, to show the position and almanac of a source at a different time, one can use the optional utc argument, as follows:
show moon, utc=$date+1where in this example the expression
$date+1
has been
used to ask for the position of the moon in 24 hours. See the
documentation of the Date datatype for details
on date specifications. For the above case I could also have specified
the time explicitly, like:
show moon, utc=1-FEB-1999:23:57:19to achieve the same effect.