Ephemeris a game of strategy your aim is to be the first player to position the planet pieces on the board into the constellations which match the cards in your hand. They must all be in place simultaneously to win and achieve your ‘Ephemeris’! A solar system quiz game, answer questions as you go. Over 200 questions with tons of information to enjoy. Each question has a choice of two answers, test your celestial knowledge or learn more!