Primilune: First Crescent Moon

Primilune helps you see the first crescent Moon on the evenings after the new moon. It tells you where to look for it, when, and with what. A VERDICT IN FOUR COLOURS For each evening, a dot tells you how the crescent can be seen: green to the naked eye, orange with binoculars, red only with a more powerful optical aid, black if there is no visible crescent. The verdict follows Mohammad Odeh's criterion, built on 737 real observations, and the Danjon limit established by Fatoohi, Stephenson and Al-Dargazelli. THE SKY AT TRUE SCALE The sunset, the crescent and the bright planets (Mercury, Venus, Mars, Jupiter) are drawn in their real places and at their real size. You can change the time to follow the evening. Tap the Moon: an eyepiece magnifies it. OUTDOORS Turn your phone: the full sky shows the sunset area in large, with fingers drawn to scale, so you can measure the sky with your own…