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Division commander, 84th Division, Maj. General Hale, with division staff and attached French officers, Camp Zachary Taylor, Ky., November 21, 1917 (LOC)

Image by The Library of Congress
Division commander, 84th Division, Maj. General Hale, with division staff and attached French officers, Camp Zachary Taylor, Ky., November 21, 1917
1917 November 21.
1 photographic print [...]

Question by athorgarak: What is the general difference in sea level for high and low tides?
I assume (based on general ignorance and forgetfulness) that high and low tides are generally steady in their respective levels and that their absolute levels are cyclical, based on lunar position.
What is the average difference in average high and low [...]