On a flat Earth, there is an equator line.
On a globe Earth there is also an equator line.
On the flat Earth, if you fly around the equator, you ALWAYS have to keep turning.
On the REAL Earth, you can fly above the equator forever if you have the fuel, without turning left or right, EVER.

End of argument. They lose and there is no counter for that one.

At a certain time, say, 6:10 am, the sun rises over New York city.
But the *same sun* does not rise until 9:10 NYC time, in San Francisco

How can this be if the word is FLAT? It can't. The sun would have to rise at one
universal time all over the planet

Point II. Midnight Baseball
On June 21 every year, the summer solstice, a traditional game of baseball is
started at midnight *under the sun* in Anchorage, Alaska. Meanwhile, in the
same time zone and right to the south, in San Francisco, they are in total
darkness and have been for 3 hours. How can this be if the earth is flat and
everyone on earth sees the sun at all times that it is visible anywhere?

@earl-of-trumpssaid At a certain time, say, 6:10 am, the sun rises over New York city.
But the *same sun* does not rise until 9:10 NYC time, in San Francisco

How can this be if the word is FLAT? It can't. The sun would have to rise at one
universal time all over the planet

Point II. Midnight Baseball
On June 21 every year, the summer solstice, a traditional game of baseball is
...[text shortened]... e on earth sees the sun at all times that it is visible anywhere?

Flat earthers are friggin' GONE

On line communication gives you very little indication why people write the things they do. The virtual world lacks sufficient dimensions to be flat and the sun never illuminates it!

@sonhousesaid On a flat Earth, there is an equator line.
On a globe Earth there is also an equator line.
On the flat Earth, if you fly around the equator, you ALWAYS have to keep turning.
On the REAL Earth, you can fly above the equator forever if you have the fuel, without turning left or right, EVER.

End of argument. They lose and there is no counter for that one.

So your argument against there being a flat earth is that a straight line is different on a sphere?

@divegeestersaid So your argument against there being a flat earth is that a straight line is different on a sphere?

The shortest distance between two points on a surface is called a geodesic. On a plane a geodesic is a line segment, in accord with the Euclidean geometry humans have known about for thousands of years. On a sphere a geodesic cannot be a line segment, as such a path would deviate from the sphere immediately.

A "triangle" on the surface of a sphere would consist of three geodesics as expected, but they would meet in such a way that the measures of the interior angles would add to more than 180 degrees. In fact the sum of the measures would vary depending on how large the "triangle" is, with bigger "triangles" having larger measures. This is an example of a non-Euclidean geometry. Relativity theory uses another kind of non-Euclidean geometry.

@soothfastsaid The shortest distance between two points on a surface is called a geodesic. On a plane a geodesic is a line segment, in accord with the Euclidean geometry humans have known about for thousands of years. On a sphere a geodesic cannot be a line segment, as such a path would deviate from the sphere immediately.

A "triangle" on the surface of a sphere would consist of thre ...[text shortened]... idean geometry. Relativity theory uses another kind of non-Euclidean geometry.

I'll shut up now.

Yes I’m aware of the dynamics of lines on curved surfaces but thanks for showing off your maths training to me anyway.

How does the OP “bust” the flat earth argument when a flat earth believer doesn’t believe that the earth is a curved surface?

@soothfastsaid I don't know. Logically analyzing the illogic of pseudosciences and crank theories is not something I'm up to this weekend.

Sonhouse often seems to have the perfect IT, political or social solutions in his head, but somehow they lose it on the way from there to his keyboard.

Like a great dream you had last night but struggle to describe over breakfast.