Examples
Examples
Try the starting example
- Altitude above horizon (degrees)
- 45
- Plane-parallel relative airmass
- 1.414214
Try another scenario
- Altitude above horizon (degrees)
- 49.50000000000001
- Plane-parallel relative airmass
- 1.315087
Calculation method
Calculation method
Plane-parallel relative airmass
Secant zenith approximation=1/sin altitude.
Symbols and units
- a
- Altitude above horizon (degrees)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Plane-parallel estimate, limited to altitude ≥10 degrees; refraction/curved atmosphere excluded. Supported limits: All required fields must be finite values of the exact declared type and within displayed bounds. Lists contain1–1000 finite numbers. JSON tables are numeric rectangular rows, at most100 rows and30 columns; individual tools have stricter shape/domain constraints. Plane-parallel estimate, limited to altitude ≥10 degrees; refraction/curved atmosphere excluded.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.