Tools

Object Altitude vs Time

What This Calculator Tells You

See how an object's altitude changes throughout the night. This chart helps you plan your observing session by showing when the object is highest and how long it stays at a good altitude.

Loading calculator…

Understanding the Data

  • Higher altitude is better: Objects above 30° suffer less atmospheric interference
  • Below 0° (horizon) means the object is not visible
  • The peak altitude occurs when the object transits (crosses the meridian)

Sample Objects

ObjectRADec
Orion Nebula (M42)5.59h-5.4°
Andromeda Galaxy (M31)0.71h+41.3°
Whirlpool Galaxy (M51)13.50h+47.2°
Ring Nebula (M57)18.89h+33.0°

Click a row to load its coordinates into the calculator.

Related Calculators