//[astronomy](../../../index.md)/[io.github.cosinekitty.astronomy](../index.md)/[LibrationInfo](index.md)/[elon](elon.md) # elon val [elon](elon.md): [Double](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-double/index.html) Sub-Earth libration ecliptic longitude angle, in degrees.