CelestialGuide vs Every Planet

Celestial Guide is an interactive database of information about stars and planets. Its basic interface is a map of the sky as seen from any point on Earth at any point in time. The user can manually choose the time and location, or the iPhone's or iPad's GPS and clock can be used to select the current time and location. If the device is pointed at the sky, the map on the screen will be presented corresponding to the actual view in that direction. The star database includes stars brighter than magnitude 9. The user can select the minimum visible magnitude, which allows the map to conform to the stars which are visible to the user based on local viewing conditions. CelestialGuide presents accurate locations of planets and comets, including rendering of eclipses, transits and occultations that are visible from the selected location. CelestialGuide also has a database of Messier Objects. CelestialGuide also includes a Virtual Orrery, displaying the relative position of the planets and comets at any point in time.

Every Planet turns the whole observable universe into something you can hold in your hand. Tap once and the World Forge builds a planet that has never existed before: an ocean world wrapped in cloud, a ringed gas giant, a lava world cracked with light, a frozen wanderer far from its star. Every world is unique and generated from a single seed, so the one you just made is one you will never see again unless you keep it. The worlds are imagined. The physics behind them is not. Every planet carries an honest science dossier. Its year is computed with Kepler's third law. Its warmth comes from the real luminosity of its star and the greenhouse effect of its air. You see its distance from Earth, the year your light would arrive, the length of its day, its host star's temperature, and whether liquid water is even possible. Estimates carry honest uncertainty, the way real astronomy does. WHAT YOU CAN DO Forge a world Make a new world in a tap, or aim the Forge toward what you want to find: water, a giant, two suns, or simply something strange. Keep the ones worth keeping Save a world to your Archive, give it a name, and write a note about why you stopped there. Unsaved worlds are gone the moment you move on, so the good ones are worth catching. Read the real science Open any world's dossier for a plain, careful explanation of its orbit, star, mass, and light, tied back to the methods astronomers actually use. Learn the universe, and remember it The Observatory holds short daily recall questions built on spaced repetition, so real ideas actually stick. Track a gentle streak and watch how much of the sky feels familiar. Travel outward Every discovery carries you about eight percent deeper into space, past real landmarks, all the way to the edge of the observable universe. Go deeper in the Observatory An orbit lab to move a world through space, a field guide to the stars that make planets possible, an atlas of twelve genuinely strange real worlds, a guide to how we find planets we cannot see, and the big numbers that put it all in scale. QUIET BY DESIGN No account. No ads. No tracking. Everything you make stays on your device. Optional ambient audio for the long trip outward. Built to be calm, factual, and yours. There are around seven hundred quintillion rocky planets out there. Humanity has confirmed about six thousand. Every Planet is a small, honest way to feel that scale, one world at a time.