measures - Tool

Postscript file available

details for the measures operations - user

Description
The variables in this group describe non-standard operation of the measures conversion programs. Normal practice is that the nutation, aberration and the position of the sun for the purpose of light-bending corrections, are calculated with the aid of an analytical series. To limit calculation times in loops, the calculations are linearly interpolated over a (defined) period. This period can be defined with the d_interval variables. The nutation calculation can be improved by using the IERS tables; while all calculations can be also be done using the JPL DE200 or DE405 tables. They also steer the selection of the IAU1984 or IAU2000 precession/nutation model; and the use of high or low precision nutation series (uas or mas).

Example

measures.default:                   gui
measures.precession.d_interval:     0

specifies that a measures GUI is started up automatically, and do full calculations on precession always.

Aipsrc Variables

measures.default	specify user interface medium
	Allowed:	gui or screen
	Default:	screen
measures.iau2000.b_use	use the IAU2000 precession/nutation model
	Allowed:	true or false
	Default:	true
measures.iau2000.b_use2000a	if the IAU2000 precession/nutation model is used, use the high precision nutation
	Allowed:	true or false
	Default:	false
measures.precession.d_interval	interval in days over which linear interpolation of precession calculation is appropiate
	Allowed:	number of days
	Default:	0.1
measures.nutation.d_interval	interval in days over which linear interpolation of nutation calculation is appropiate
	Allowed:	number of days
	Default:	0.04
measures.nutation.b_useiers	use the IERS Earth orientation parameters tables to calculate nutation
	Allowed:	true or false
	Default:	false
measures.nutation.b_usejpl	use the JPL DE database (use measures.jpl.ephemeris to specify which one) to calculate nutation
	Allowed:	true or false
	Default:	false
measures.aberration.d_interval	interval in days over which linear interpolation of aberration calculation is appropiate
	Allowed:	number of days
	Default:	0.04
measures.aberration.b_usejpl	use the JPL DE database (use measures.jpl.ephemeris to specify which one) to calculate aberration
	Allowed:	true or false
	Default:	false
measures.solarpos.d_interval	interval in days over which linear interpolation of solar position calculation is appropiate
	Allowed:	number of days
	Default:	0.04
measures.solarpos.b_usejpl	use the JPL DE database (use measures.jpl.ephemeris to specify which one) to calculate solar position
	Allowed:	true or false
	Default:	false

Next: measures.directory - Tool Up: aipsrcdata - Module Previous: logger - Tool Contents Index

	Package	utility
	Module	aipsrcdata