Will the sky be clear tonight? Star Index turns cloud cover, moonlight, and twilight into one 0-100 score, so you know at a glance whether to go stargazing.

Features

• 01.

  Star Index (0-100)

  Cloud cover is broken down by altitude and combined with humidity, wind, moon phase, and twilight into a single score. See hourly and weekly forecasts to plan your best night. Seeing and transparency are estimated separately, so you can judge conditions for planets versus faint nebulae and galaxies.

• 02.

  Deep-Sky Catalog

  Browse visibility for all 110 Messier objects plus major NGC targets, with a shooting window for each night worked out from twilight end and moonrise. Rise, set, direction, and altitude for planets and the Moon are all in one place.

• 03.

  Never Miss a Meteor Shower

  Star Index rates viewing conditions for 8 major meteor showers (Quadrantids, Perseids, Geminids, and more) and sends a push notification as the peak approaches. Eclipses and planetary oppositions are also on the built-in calendar.

• 04.

  Home Screen & Lock Screen Widgets

  Keep tonight's Star Index visible at a glance, without opening the app.

Screenshots