API Reference / limitingMag · function

Function: limitingMag()

function limitingMag(
   stage, 
   moonAltDeg, 
   moonIllum, 
   bortle): number;

Effective naked-eye limiting magnitude: the more restrictive of the twilight-brightness ceiling and the site's dark-sky limit, then reduced when a bright Moon is up. With no Bortle class, the dark-site limit defaults to 6.0 (suburban), matching the original behavior.

Parameters

Parameter	Type
`stage`	`TwilightStage`
`moonAltDeg`	`number` \| `null`
`moonIllum`	`number` \| `null`
`bortle`	`number` \| `undefined`

Returns

number

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