Surely Polaris is a spectacularly poor choice for obtaining accurate Sidereal time via a meridian transit of a known star? A theodolite suited to high altitude observations like the Wild T4 was is desirable.
Otherwise a prism and a mercury mirror 9or equivalent) can be used to covert a theodolite into a prismatic astrolabe. Bruce. > On 28/12/2021 09:18 Brent <brent.ev...@gmail.com> wrote: > > > My understanding (and I could be wrong) is that one could derive 'stellar' > time from a start sight/fix on polaris or another well tracked celestial > object. I was once told that early editions of Bowditch provided the > process (for the moon I was told) although one of the relatively old > edition's that I have doesn't provide it. > > Some theodolite manufacturers provided attachments to aid the process (for > the high zenith where a theodolite experiences reduced accuracy), and those > attachments were dated and calibrated for their year of manufacture and > came with tables for use in future years. > > That's about all I know or can find on the subject. Can anyone here point > me to any published literature? Anyone have experience trying? Any idea > what type of accuracy can be expected? > > Got some new toys coming and need something to do with them.... > > Brent > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an > email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.
