- RishiCalc
- This applet will calculate the planetary
positions, ascendant, nakshatra, navamsa placement, and vimshottari
dasha periods for any time, according to Lahiri ayanamsa. It
also draws a simple representation of the Rashi chart. Planetary
positions in the Rashi chart are not degree-accurate, but simply
reflect house placement. Rahu and Ketu positions are mean or average
positions.
- 28.8 download time is about 30 seconds.
- How to Use
RishiCalc:
- Enter hours as 0 - 23.
- Use negative values for Western time zones,
e.g.:
- EST: -5
- CST: -6
- MST: -7
- PST: -8
- All time zones east of Greenwich are
positive.
-
- Don't forget to click on the Daylight
Savings Time box ("dst") for a daylight savings time chart
in order to get the correct time calculation.
-
- Longitude and Latitude must be filled in for
the applet to function. If you don't know the longitude and latitude
of a city or place, the best online resource is Astrodienst.
It will also tell you the proper time zone to use.
- Remember that for Western (i.e. positive)
longitude values, the time zone offset value must be entered as
negative. When the Eastern longitude box is checked, the time zone
offset value must be positive. Any other values are a mistake, and
give an error.
- NOW button gives current time, date,
and zone from your local system clock.
- CLEAR button clears all fields;
resetting RishiCalc for a new calculation.
- CLOCK button makes RishiCalc
continuously update (every second) until stopped. You must have all
the fields filled in properly for this to work. Click NOW and then
fill in the longitude and latitude.
- STOP stops the clock.
- CALC button calculates a chart.
Remember: no chart will be calculated if any field is empty.
Notes on Accuracy
RishiCalc applet can be counted upon to give
good values for the planetary longitudes (usually +/- 2 arcminutes). The
ascendant algorithm is highly accurate (thanks to Brian Conrad of JyotishTools
- he also provided the Lahiri algorithm, which is good, too!) This means that RishiCalc is useful for most common jyotish applications.
