Regulating a Mechanical Wrist Chronometer Movement

https://calibercorner.com/seiko-caliber-nh35a/

The attached YouTube link explains the regulation of a mechanical watch movement very well. The movement shown in the video is a NH 35A made by Seiko and has the potential to be accurate enough for celestial navigation when a daily rate correction is applied. https://www.youtube.com/watch?v=vz_1rhl1lvY&list=LL&index=6&t=124s

Correction Table For Nautical Almanac Exactly Four Years Out Of Date.

The above table will correct the daily page star SHA Dec list on a Nautical Almanac exactly four years out of date to the current year. The Sun data can be used as is uncorrected.

Ex-Meridian Short Table

This Ex-Meridian short table can be used with a pocket trig calculator or slide rule to obtain an accurate latitude. Add the correction to a bodies altitude that is near meridianal passage (MP) and then solve for latitude as if observed exactly on the meridian. +XM' = minutes of arc to add to observation Ho. t = meridian angle L = latitude d = declination Ho = corrected observed altitude

Weather Proof Custom References and Trig Tables

An alternative to lamination for weatherproofing useful tables and references is to use three ring sheet protectors with a 1/2 inch binder. Pages are very easy to handle.