BAIT: refract command

NAME

refract - calculates the atmospheric refraction

SYNOPSIS

refract ha dec | ra dec lst

DESCRIPTION

This program calculates the observed-predicted values of the hour angle, declination, and the rate of change per second of these values.

NOTE: The hour angle term is not angular.

All four values are printed to stdout in decimal degrees. There are two way of specifying the input angle: If two arguments are specified they are assumed to be the hour angle and declination of the target in hh:mm:ss dd:mm:ss format. If three arguments are specified they are assumed to be the RA, DEC and lst all three in babylonian format.

The observatory latitude is taken from the symbol OBSLAT in the file $HOME_DIR/ ait.config.

BUGS

The refaction formula is the simple version taken from the Astronomical Almanac and assumes a atmospheric pressure of 1013 millibars and a temperature of 20 C.

SEE ALSO

ait.config.