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Columbus and Celestial Navigation used a Astrolabe and Dead reckoning tools. Just think of taking a curse with Columbus in 1492 . At this time there was no real time keeping for Longitude. By this

Using a ASTROLABE for finding time VIDEO https://m.youtube.com/watch?v=tt-_GKmX8dk Dave

Here one how Accurate can is a compass. This helps The resolution on a digital component is 0.1° . Using solar north a simple way of finding Longitude gives a location to at the Equator of lessthan 7

*This last chance to buy low cost tools for long time* Dave

This was the first actual job on this mill was actually for this mill. The vise was a horrible import that was rendered into a useable one with a bunch of mods. The jaws were surface ground, the

https://www.youtube.com/watch?v=ObC6a2vIe8g Diamond 22 horizontal milling machine modifying a vise. https://www.youtube.com/watch?v=ObC6a2vIe8g

*Here is a ?nice Video on Unitmate mini lathe in use.* https://www.youtube.com/shorts/OO0_LObYHh8 I have not see this fetcher on mlnl lathe on a Unitmate mini lathe. *This is from

*Found great replacement for old dusty GPS .* * This need no batteries and no Satellite need. It is made in brass with plating to keep brass look. Free shipping too.* *You should buy two , one for a

Here time line **?????? ? ? ? Astrolabe first real Navigation tool ? ? ?** ? The astrolabe is an intricate astronomical instrument invented in Ancient Greece around 150 BC.

Calculation of Great Circle navigation. If have a global and string you do same thing. You see photos of globals on ships some navigators will use pins on global for location and where going.? Cuts

Link to web site for sextant for time. https://astrolabesailing.com/2016/10/04/celestial-navigation-measurement-of-time/ Dave

*Symbols and abbreviations for worksheet* - Hs: Sextant height/altitude - Ha: Apparent sextant height/altitude - Ho: Observed sextant height/altitude - Dip: Depression of the horizon - Sun corr.:

Here is a pdf file on the basic inputs used for location

Search Engine in excel file below General ------- Name Language Backend ownership Ask.com ( https://en.m.wikipedia.org/wiki/Ask.com ) Multilingual Google United States (

* Just think of son's ? thinking each coin worth $3,500 each times 9 to 12. O h$^% Dad might have more than 12 . * *I go though allow the junk pile for $31,500 to over $42,500* * Dam Dam Dam* *He

Here one made by the Chinese https://www.bing.com/videos/search?q=frame.licker+engine&view=detail&mid=E2B691BAEF5CE2255ED9E2B691BAEF5CE2255ED9&FORM=VIRE&PC=EMMX01 Dave

Here is a book I found on the Sextant https://archive.org/details/manualofsextantc00thom/page/3/mode/1up Dave

Here is a Excel spreadsheet made easy.

Looks great A machinist had nice job watching the shaper Dave

Monarch 20x96 inch engine lathe. https://www.youtube.com/watch?v=jcAXZk6XkQs