Plan for your sky

Choose a pattern for tonight.

Set your latitude, longitude, date, month, and sky darkness. Sort by tonight for an evening plan or by seasonal month to browse ahead. Bring the 50°N planner card into the field.

Use it in the field

Times are planning estimates. Check the horizon, weather, and local conditions before you leave. Moon information is available for 2026 dates.

Latitude 50°NLongitude -114°Date Month Rank by Sky darkness Bortle 4 · limit V 6.1 Include monthly Moon penalty

Ranked observability

Choose a date for tonight’s window. Use Month to compare the season ahead.

Bortle class describes sky brightness. The visibility column counts the pattern’s defining stars that should show at your selected darkness.

Rank	Asterism	Best-month	Transit altitude	Hours above 20°	Best window tonight	Geometry	Sky visibility	Moon at best hour	Monthly Moon penalty