HST Nominal Roll Calculator
Please complete the form and submit using the Calculate button.

	Single Target Position
	Target RA hh:mm:ss.ss	Target DEC (-)dd:mm:ss.s	Start Date mm/dd/yyyy	End Date mm/dd/yyyy
	Multiple Target Positions hh:mm:ss.ss (-)dd:mm:ss.s mm/dd/yyyy
	Instructions: Select the Single Target Position Form to calculate the roll angle of a single target position over a range of dates. Select the Multiple Target Positions Form to calculate the roll angle of a series of target positions on specific dates. This form is provided to facilitate calculations of nominal roll angles for moving targets. Enter the relevant target position and date information for your target(s) and submit using the Calculate button.