Purpose

With no arguments, show the current rotator position angle as
it would appear on FACSUM. With one numeric argument, set the
rotator to the specified sky position angle.

Usage

skypa [-relative] [angle]

Arguments

angle = rotator position angle [degrees]

Options

-relative = apply a delta move; default is absolute move

Output

Current or new position angle [degrees]

Restrictions

- LRIS must be the selected instrument

Exit values

0 = normal completion
1 = wrong number of arguments

Example

1) Show current LRIS slit angle w.r.t. north

skypa

2) Set LRIS slit angle to 90 deg (running east/west)

skypa 90.

3) Increase current LRIS slit angle by 10 deg

skypa -rel -10