Ri-chard wrote:
BS: They do not disappear over the horizon. Your eyesight is limited. That has been proven time and time again with cameras, binoculars and telescopes. Nice try. The seas have sea levels - not sea curves.
Planes fly in level flight - not flying down a curving spinning ball. Your false narratives are hilarious.. The pilot never looks down for the horizon - it's always straight ahead. WTFU!
All you have is CGI pics and cartoons.
I was in the navy, ships do actually disappear over the horizon.
If you are on the deck 50 feet above the water, the horizon is 8.65 miles distant.
In the navy, I was an aircrewman, at 30,000 feet above the sea, ships still disappear over the horizon.
At that altitude the horizon is 212 miles distant.
For example, I was a radar operator on a navy patrol plane and, depending on circumstances, we flew our search missions anywhere between 500ft and 30,000ft. Since radar is a line-of-sight transmission, from 30,000 feet a surface target "blip" would disappear from the scope at 212 miles. Pretty simple concept to understand.
Mean sea level (MSL) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead a long-term average of tide gauge readings at a particular reference location.
In a nutshell, when speaking of sea levels, the word "level" does not mean flat.
Sea level, or the level of the sea, depends entirely on the volume of water in the sea,
i.e., the more water, the higher the sea level, and conversely, the less water, the lower the level of the sea.