Recently, I was reading a paper in the MNRAS and the author casually referred to pointing their telescope toward the Sun-Earth L5 point. Now, I imagine working out where that is in the sky involves offsetting from the antisolar point by a fixed (slightly varying as our orbit is elliptical) number of degrees along the ecliptic, with the L4 being on the other side of the antisolar point. I looked at The SkyX and some other bits of astronomical software I have knocking about (including AstroPy) but have found none that will tell you the RA/Dec of the L4/5 points from a given location at a given time.
Does anyone know – offhand – what that offset is for the Sun-Earth L4/5 please? Alternatively, can you point me at some software that would?
I can only imagine that finding the Earth-Moon Lagrange points must be much harder.
Brilliant. Really hadnt realised you just had to look 60 degrees in front or following the sun. That makes it pretty easy, get the sun’s position on ecliptic in RA/Dec, convert to ecliptic cooords, add 60 degrees and convert back to RA/Dec again. Sure I can find something in AstroPy to do most of that. I imagine that drops it nicely into the edge of the Zodiacal light.