Hello!! It's Joseph

  In spreadsheet by pmh099 (Peter Hakel) website github   Astron USNO Web clone for moon, planets, bright stars, polaris, which is provided by Reed Navigation skycalc notes JB astronomical almanac Nautical Almanac 2010 by USNO hgus1294 HMNAO   facebook 1 facebook 2   IAU in 2000 resolution: Why astronomers are suspicious: sidereal time seems to have gone... ... and so have equinox and ecliptic: why? ... the new zero point for right ascension is something elusive called a "non-rotating origin"     The History of Celestial Navigation : Rise of the Royal Observatory and Nautical Almanacs  slideplayer   computer nautical almanac Toyama maritime college,  Japan 2001

camera: ASI120MM QHY guidescope exposure: 7 sec gain: 40 offset: 0 stack of 400 light frames and 25 dark frames  auto-flatten by fitworks output of astrometry 2 Oct 2021: stack of 250 light frames exposure: 10 sec gain: 20 auto flatten by fitworks