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Now that I think of it the National Oceanic and Atmospheric Administration had been under fire for a long time re the amount of taxpayer's money it gobbled up .. looking thru it all it seems they were having a picnic on the Governments buck .. correct me if you think I'm wrong.

[NOAA Link](ftp://ftp.library.noaa.gov/docs.lib/htdocs/rescue/cgs_specpubs/QB275U35no145thed1941.pdf). * [Theodolites](https://i.postimg.cc/1XLyWR5T/Theodolites.jpg). * [Transit Micrometer Telescopes](https://i.postimg.cc/52XwYnZ2/Transit-Micrometer-Telescopes.jpg). * [Chronograph & Zenith Telescope](https://i.postimg.cc/4Nkdbw73/Chronograph-2.jpg). * [Signal Lamps and 80 Foot Tower](https://i.postimg.cc/NfBtjn2R/Signal-Lamps-Tower.jpg). * [The Finished Article](https://i.postimg.cc/c4gR6Dq4/Science.png). Now that I think of it the National Oceanic and Atmospheric Administration had been under fire for a long time re the amount of taxpayer's money it gobbled up .. looking thru it all it seems they were having a picnic on the Governments buck .. correct me if you think I'm wrong.

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That works only for static locations. For a ship travelling across longitude the zenith-to-zenith period would not be a sidereal day, but longer when traveling West and shorter when traveling East. One would need to know precise longitudinal speed or have a precise time reference to determine the difference.