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Airplanes fly level above a level surface, they don't fly in a curved path over a curved surface. Height/altitude is a measurement with respect to a HORIZONTAL (FLAT) plane, i.e. the surface of land and sea.when you fly a small plane you have to be careful as kilkenny airfield is on a certian evelation and on any given day the airpressure varies a little .
your altimeter is really a pressure gauge and if set correctly to your location and the you must know the approx elevation of where you intend to land then it will give an accurate reading of your height .
this is especially important in fog or cloud or night flying --there is pressure there has always been pressure and when you next look at a glass of water or whisky you will see the pressure making the water climb the walls of the glass .
your house weather clock is really an altimeter as it measures pressure and as the pressure alters to high pressure the weather improves .
I don't know what point you are trying to make about pressure, maybe you didn't understand me. Space is claimed to be a vacuum - I am trying to tell you that it is IMPOSSIBLE for there to be gas next to a vacuum without the gas moving into that vacuum. Do you understand that if you get a puncture in your tyre, the air in the tyre will escape? Now think of the air in your tyre as the atmosphere and what's outside the tyre as the space vacuum.
They are lights and they are in the sky, that's what you see when you look at them. The moon is not a planet in the heliocentric paradigm. Moons are moons, not planets. We can see full moons during daylight too, not just against a black sky.planets are not lights in the sky -our moon is a planet orbiting the earth and is ALWAYS a full moon as we only see it when the sun illuminates it against a black sky .
No way of validating those images are real. They are not even in colour, they have to be digitally manipulated to make them all pretty for you. You see those nice images and speculate what could be out there. The sun is not a planet either.the Hubble telescope is your friend have a look online at all the planets --not Lucy in the sky with diamonds winking at you but the planets such as our sun visible during a eclipse OF TWO PLANETS .
View: https://www.youtube.com/watch?v=umeHIxIdKxE