Partial List of Problems an Astrolabe Can Solve

• Determine the hour and direction of the sunrise (or sunset), at a given date.
• Determine the instant where the Sun will have a given Azimuth, at a given date.
• Determine the instant where the Sun will have a given Azimuth and Altitude, without knowing the date.
• Determine the hour of rise (or set) of a star on the rete, at a given date.
• Determine the instant of culmination of a star on the rete, at a given date.
• Determine the maximum altitude of the Sun over a year for a given location.
• Determine the maximum altitude of a star at a given date, for a given location.
• Determine the hour by measuring a star altitude, for a given location, at a give date.
• Determine the right ascension and declination of a star.
• Determine the sidereal time for a given location, at a given instant.
• Determine the end of the evening twilight for a given location, at a given date.