At the moment of

**Equinoctial Solar Noon**, the angle between Sun and Local Vertical matches (and shows) the latitiude you are at.

Seen from the Equator (latitude 0 deg) the Sun is over head, and seen from pole (latitude 90 deg) the Sun is on the horizon.

The length of each degree is 60 nautical miles, so

- 15 degrees is 900 nautical miles,

- 30 degrees is 1800 nautical miles,

- 45 degrees is 2700 nautical miles,

- 60 degrees is 3600 nautical miles,

and so on.

It all means that from 15 degrees (north or south) you see Sun 75 degrees above your horizon.

Sun's altitude is 900 nautical miles x tan (75 deg) = 3359 nautical miles = 3865 miles = 6220 km.

From 30 degrees you see Sun 60 degrees above your horizon.

Sun's altitude is 1800 nautical miles x tan (60 deg) = 3118 nautical miles = 3588 miles = 5774 km.

From 45 degrees you see Sun 45 degrees above the horizon.

Sun's altitude is 2700 nautical miles x tan (45 deg) = 2700 nautical miles = 3107 miles = 5000 km.

From 60 degrees you see Sun 30 degrees above the horizon.

Sun's altitude is 3600 nautical miles x tan (30 deg) = 2078 nautical miles = 2391 miles = 3848 km.

Flat model can't give consistent results of Sun's altitude measurement.

That's why some Flat Earthers try to "save the day" using "curved light rays".

Doing tha they are forgetting that the light from horizon would also be curved, showing us horizon lower than "it realy is".

If we see horizon in the horizontal plane, then in "reality" it is higher than that, making the Earth's surface concave.

Or the light from the Sun can be curved and from horizon can't through the same air?