Editing Tide (section)

=== Lunar distance ===
[[File:Bangchuidao Island.JPG|thumb|Low tide at Bangchuidao scenic area, [[Dalian]], [[Liaoning Province]], [[China]]]]
[[File:Negative low tide at Ocean Beach 1.jpg|thumb|Low tide at [[Ocean Beach, San Francisco, California|Ocean Beach]] in [[San Francisco]], [[California]], U.S.]]
[[File:Atlantic coast at low tide, Bar Harbor IMG 2262.JPG|thumb|Low tide at [[Bar Harbor, Maine|Bar Harbor]], [[Maine]], U.S. (2014)]]
 
The changing distance separating the Moon and Earth also affects tide heights. When the Moon is closest, at [[perigee]], the range increases, and when it is at [[apogee]], the range shrinks. Six or eight times a year perigee coincides with either a new or full moon causing [[perigean spring tide]]s with the largest ''[[tidal range]]''. The difference between the height of a tide at perigean spring tide and the spring tide when the moon is at apogee depends on location but can be large as a foot higher.<ref>{{cite web |title=What is a perigean spring tide? |url=https://oceanservice.noaa.gov/facts/perigean-spring-tide.html |publisher=National Oceanic and Atmospheric Administration |date=26 February 2021 |access-date=16 July 2021 |archive-date=30 July 2021 |archive-url=https://web.archive.org/web/20210730210313/https://oceanservice.noaa.gov/facts/perigean-spring-tide.html |url-status=live }}</ref>