NuitClaire tells you what to look at in the night sky right now, with binoculars or the naked eye, and guides you to it. With binoculars - The easiest targets of the moment, chosen for your binoculars, their height in the sky, the Moon and your horizon: clusters, galaxies, nebulae, double stars. - The planets that are up, with a sketch of Jupiter's four moons. - Star hopping from a bright naked-eye star, field by field, with a mini-chart oriented like the sky. With the naked eye - Some twenty hand-picked sights: the Pleiades, the Andromeda Galaxy, the Orion Nebula, the Double Cluster, Mizar and Alcor... - The Moon: its phase and what to see tonight (crescent and earthshine, maria, full Moon). - The planets, Mercury included. - Meteor showers: around the peak of the major showers (Perseids, Geminids...), how many per hour to expect, when, and where the radiant is. - Bare-hands guidance: a guide star, then so many fists at arm's length in a given direction. How targets are chosen - With binoculars, from a catalog of 435 objects: clusters, galaxies, nebulae, double stars. Only what your binoculars can show is kept: bright enough for their aperture (magnitude 8.5 with 50 mm), and, for diffuse objects, not so faint that they vanish into the sky background. - A target must be above your minimum height, in a direction where your horizon is clear, and stay there for the next hour. - Each target gets an ease score from its brightness, height and contrast. A bright Moon pushes faint galaxies and nebulae down; clusters and double stars, which cope with moonlight, take their place. - The five best are kept, with a mix of types: never five open clusters at once. - With the naked eye, the same method over some twenty hand-picked sights. Also - Guidance with the watch compass: how far to turn, how high to look. - A sky map that turns with you: facing view (the sky in front of you) or the whole sky, with constellation names and the Moon's phase. - "Tonight": a score out of 10, night hours, the Moon and the Garmin weather forecast. - Targets you have seen leave the list for 30 days. - Red on black to keep your night vision. Works with buttons and gloves. Everything is computed on the watch: no account, no connection, no data sent anywhere. The app and its settings are in French. Star data: d3-celestial (c) 2015 Olaf Frohn, BSD-3-Clause, from Hipparcos.

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