Planet zodiac

[NexLeapIO]

Can someone help me with a few questions?

1. Explain how I can calculate which zodiac sign a particular planet, Sun or Moon is currently in depending on the position of the observer?
2. How can I calculate what is the age/day of the moon at the moment?

[cosinekitty]

Astronomy Engine supports multiple programming languages. What programming language are you using? There are demos for calculating planet positions. Once you have equatorial coordinates of a planet, you can call the "Constellation" function to determine what constellation the planet is inside.

[NexLeapIO]

I mean I used ur function for zodiac. For moon age I just find next new moon after 2000 janurary 1 and calculated it. What about angle of phase? any suggestions?

[cosinekitty]

Most calendars use the Moon's geocentric ecliptic longitude to determine the phase. New Moon occurs when the Moon's ecliptic longitude is the same as the Sun's. First quarter occurs when the longitude difference is 90°, etc. There is a function MoonPhase that is provided just for this purpose. You can also use SearchMoonPhase to find the next time the Moon reaches a desired phase angle.

[NexLeapIO]

I mean I want get rotation from observer too, like this

[cosinekitty]

You should take a look through the Node.js demos, and particularly at the Camera demo.