Skyplot

Big 3 calculator: Sun, Moon and rising sign

Your “Big 3” are the Sun sign, the Moon sign and the rising sign (ascendant). Enter your birth details to see all three, with a short text for each.

Place data: GeoNames (CC BY 4.0). Calculations run in your browser; nothing you type is sent to a server.

Keep your chart with you

The Skyplot app for Android does everything on this page, and goes further:

In the free app

  • Your chart saved on your phone: open it any time, even offline
  • A personal sky note every day
  • Today's Moon on your home screen (widget)
  • Compatibility with a friend, plus an invite link
  • Birth time sensitivity: what changes if your time is off

With Skyplot Pro Pro

  • 12-month personal sky calendar
  • Personal transit notifications (off by default)
  • Add personal transits to your calendar
  • Unlimited people and the full synastry aspect list
  • Chart printout (PDF)
  • Solar return chart
  • Extra house systems: Whole Sign, Equal, Koch, Porphyry

One-time payment. No subscription.

Get Skyplot on Google PlayNo account. Your birth details stay on your phone.

Why the birth time matters

The Sun stays in one sign for about a month, so the date alone is usually enough. The Moon changes sign roughly every two and a half days, and the rising sign changes about every two hours. Without a time, Skyplot shows the Sun, lists both possible Moon signs if the Moon moved that day, and leaves the rising sign out.

The Moon phase on your birth night

The tool also shows which of the eight Moon phases was in the sky when you were born, from new Moon to full Moon and back. It is the same angle between the Sun and the Moon that you can see from your window.

Where the numbers come from

Clock times are converted to universal time with the historical time zone of your birth place, including daylight saving time in years when it applied. The offset used is printed under the result so you can check it.

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