It needs to be a clear night for stargazing. Try to find a darker area without too much light pollution. If you want to do back garden constellation spotting, turn off any unnecessary lights.
A curved semi-circle of seven stars between the constellations of Boötes and Hercules, there's an easy way to find it in April: Go outside two hours after dark and look to the east-northeast.
In each of these quests, you’ll need to find a location in a patrol zone or in the “Starcrossed” mission and use the Wish-Keeper bow to create constellations by shooting the stars.