What is your Function?
What does it mean?!
Not much other than Jupiter and Saturn happen to almost line up from our point of view here on Earth Dec 21, 2020.
December 21, 2020 approximately 5:30pm PST (below)
December 20, 2020 approximately 5:30pm PST (below)
December 19, 2020 approximately 5:30pm PST (below)
December 19-20, 2020 all from about 5:30pm PST. Jupiter here is from the 20th. (below)
Some imaging details for my record and anyone interested. Taken using eyepiece projection with 500mm focal length + 16mm eyepiece + Canon EOS-M6 mkII (crop factor 1.6), 4k video at 30fps. Processed with RegiStax6 and Photoshop.
My rough and possibly incorrect estimate is that is a magnification of about 50x:
(478mm focal length / 16mm eyepiece) * 1.6 crop factor = 47.8x magnification
Exposures: 20-40 second clips
Jovian moons 1/30s @ 12800iso
Saturn 1/30s @ ~1600iso
Jupiter 1/30s @ ~640iso.
William Optics GT-81
Focal length 478mm
Eyepice: Celestron 24-16mm Zoom
Camera: Canon EOS M6 mkII