Orrery (4/5 stars, all ages) is today’s Amazon Free App of the Day, and it’s a great one for armchair astronomers and historians alike.
An orrery is a tool ancient astronomers used to plot the movements of the planets and their moons over time in order to accurately predict astronomical events such as planetary alignments and eclipses, as well as the positions of the planets and moons on specific, future dates.
Orrery is an app that provides a virtual, 3D orrery right in your Fire tablet or Android mobile device! From Amazon:
Experience our solar system and visit its planets with this digital 3D orrery.
Just sit back and orbit the planets or even land on some of them while listening to soothing background music…
– Smooth camera navigation
– Realistic planet radii (gas giants are proportionally downscaled)
– Realistic orbital speeds
– Explorable surfaces: Mercury, Venus, Moon, Mars
– Wikipedia excerpts
– Speed slider
– Date input
– Ambient music (optional)
– Optional asteroid fields
– Optional trails
– Optional lens flare
– Quality option
– Portrait- and landscape support
– Localized for english and german
Note that this app is not compatible with first-generation Fire tablets
Orrery: get it today, while it’s the Free App of the Day!