Calendar and Cosmology Tools
Three tools about time and form. The vrat calendar works out fasting days such as Ekadashi, Pradosh and Purnima for your city from where the Moon actually is, using the tithi in force at sunrise. The sacred geometry lab draws fourteen classical yantras one stroke at a time so that the construction can be followed. The biorhythm calculator plots three fixed cycles from a date of birth, a twentieth-century model some people use as a prompt for reflection.
They belong together because each turns a rule into something you can see: a lunar day into a date on a calendar, a ratio into a figure, a period into a curve.
Which of these tools do you need?
When is the next Ekadashi?
The vrat calendar lists the fasting days of the next six weeks for the city you choose. Open the Ekadashi & Vrat Calendar
How is the Sri Yantra constructed?
The sacred geometry lab draws it stroke by stroke and explains the proportions behind it. Open the Sacred Geometry Lab
Where are my biorhythm cycles today?
The biorhythm calculator charts the physical, emotional and intellectual curves around today. Open the Biorhythm Calculator
All cosmology tools
Sacred Geometry Lab
The mathematics behind the divine
Free sacred geometry lab: watch fourteen classical yantras (including the Sri Yantra) draw themselves stroke by stroke, and learn the precise mathematics — ratios, angles, the golden ratio — encoded in each.
OpenBiorhythm Calculator
Your physical, emotional & intellectual waves
Free biorhythm calculator: plot your physical (23-day), emotional (28-day) and intellectual (33-day) cycles around today and see exactly where each wave sits right now.
OpenEkadashi & Vrat Calendar
The sacred lunar days rising over the next six weeks
Free Ekadashi and vrat calendar: a living Hindu lunar calendar with an animated moon phase, computing today’s tithi and the upcoming Ekadashi, Purnima, Amavasya, Pradosh and more from the real positions of the Sun and Moon.
Open