This tab contains several options for calculation.
These options can be used to configure custom Ayanamsa.
Standard configuration of custom Ayanamsa is based upon a reference value at a given date (normally Jan 01 1990 = 2415020.5).
- Date t0 - reference date for Ayanamsa. Format is julian date.
- Ayanamsa at t0 - value at the date t0. Format of this field is double.
Advanced Cusom Ayanamsa Configuration
The constant period
can be used to change the speed of vernal point movement.
Default button: the built-in default values will be set. These values are based upon the built-in values of Lahiri Ayanamsa.
Caution: changes of these parameters can cause major calculation errors!
Remarks on Ayanamsa can be found in the Ayanamsa section.
Sunrise and Sunset
These options take effect for special Lagnas, Kala Velas and Hora calculation.
The difference between the option will be about several minutes of time.
Whether the center or the border of the disk shall be in the horizon at sunrise/sunset time.
Refraction is an optical phenomenon that is based upon the curvature
of the sunlight in the atmosphere. Refraction will be
taken into account if you check this option (apparent position).
Path for Ephemeris Data Files
Ephemeris data files can be used to increase the precision of the built-in
A detailed instruction for installation of these data files can be found in the section on Ephemeris Data Files.
Caution: calculation options are very sensitive parameters!
You should not change these parameters if you are not sure what you do!
Calculation options are described in detail at the Calculation section.
The default button can be used to reset the values to the built-in defaults.