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On USDF in ~/notebooks I made CanonShow.ipynb, gets and displays allsky images.
Image names are
asc2407260306.cr2
2407 is year and month
26 is date
then xxxx is sequence number.
spacing starts 5 min apart at low seq number.
images begin at noon in timestamp units. I think that's around 0800 local Chile time, so morning.
I think timestamp is in UT. Good.
at 2300 the interval changes to 1 minute. That continues until 1000. Images taken around 0200 should be evening twilight. On July 26 that is image number around 313
Image 0513 has timestamp of 0520 and shows stars.