Some, such as the Great Dog or the Whale, 1( are named, named, naming, were named) after the animal. Others, such as the Centaur, 2(took,have taken, takes, take) their names from creatures or people in ancient stories. In the past, sailors 3(was travelling, travelling, travelled, travel) across the ocean used the constellations 4(find,to find, finding, found) their way. During 5(this,that,those, these) voyages, some new constellation 6( discovered, discover, have discovered, were discovered). They 7(were given, given, gives) names, such as the Sails, after parts of the ship. Some constellations, such as Orion, 8(seen, can be seen, can see, be seen) in the southern sky for half of the year and the northern sky for the other half.
