Astronomical data

Astronomical data for Saturday , 04/20/2019
Begin of astronomical twilight* (UTC+1) 3:08 AM
Begin of nautical twilight* (UTC+1) 4:02 AM
Begin of civil twilight* (UTC+1) 4:47 AM
Sunrise (UTC+1) 5:23 AM
Solar noon (UTC+1) 12:28 PM
Sunset (UTC+1) 7:33 PM
End of civil twilight* (UTC+1) 8:10 PM
End of nautical twilight* (UTC+1) 8:56 PM
End of astronomical twilight* (UTC+1) 9:49 PM


*Dawn and dusk (twilight) periods are time spans before sunrise or after sunset, respectively:

  • Civil twilight is the time before sunrise and after sunset when the sun is at a maximum angle of 6 degrees under the horizon. Usually it is possible to read the paper under these twilight conditions. First stars become visible (up to magnitude 1).
  • Nautical twilight is the time before/after the civil twilight when the sun is at a maximum angle of 12 degrees under the horizon. The most important stars are visible (magnitude 3) as well as the horizon. Therefore, nautical positioning using classical instruments is possible.
  • Astronomical twilight is the time before/after nautical twilight when the sun is at a maximum angle of 18 degrees under the horizon. Horizon is not visible anymore, all stars become visible. After/before that twilight all stars are visible.