Is The Earth A Flat Round Disc or Is It a Round Spherical Globe?

[verpies]

Eratosthenes did it more than 2000 years ago:
https://en.wikipedia.org/wiki/Eratosthenes#Measurement_of_the_Earth.27s_circumference

Eratosthenes used two points of measurement, but a three colinear points of measurement would need to be made at the same time to accurately gauge the curvature without any further assumptions.

Also, Eratosthenes did not account for the refraction of sunlight by the atmosphere which is giant convex lens over Earth's surface.

[verpies]

You can find many photos of tall buildings that appear to lean "inwards" toward the top.

Only because the Z-axis distances from the observer to the base and top of the building are not the same, when the observer stands on the ground. 

If the Z-axis distances are the same for the observer, then the perspective is unable to create this illusion of "leaning inwards toward the top".

[AlienGrey]

Yes it's all very amusing isn't it (that's not a question), Have any of you ever seen a poltergeist at work or seen an entity ? they are clever beings they  lie and deceive, pretend to be a child to gain entry  and are excellent at trickery,

I've come to the conclusion any form of manipulating control is demonic and this stuff is linked to religious days of old and now evil manipulators, if you want to go down this route then perhaps your going to end up with the controlling entity's your entertaining when you pass over, because that's the name of the game they are playing with you, be careful what deception you choose.

[tagor]

Only because the Z-axis distances from the observer to the base and top of the building are not the same, when the observer stands on the ground. 

If the Z-axis distances are the same for the observer, then the perspective is unable to create this illusion of "leaning inwards toward the top".

Distance to horizon
http://williams.best.vwh.net/avform.htm#Horizon

    At a height h above the ground, the distance to the horizon d, is given by:

      d = sqrt(2*R*h/b)

    b=0.8279 is a factor that accounts for atmospheric refraction and depends on the atmospheric temperature lapse rate, which is taken to be standard. R is the radius of the earth. Note that the earth is assumed smooth- likely only true over the oceans!

    For h in feet and d in nm:

     d =1.17*sqrt(h)

    i.e. from 10000 feet, the horizon is 117nm away

    (Reference Bowditch American Practical Navigator (1995) Table 12.)

for the earth R = 6380 km (  3970 miles )

sur la photo " the observer" regarde le mont Mc kinley qui est à 140 miles soit 225.3 km
tout en etant a 2089 ft soit 636 m

la hauteur du mont Mc kinley est 3.8 miles soit 4828 m

j'utilise la formule d = sqrt(2*R*h/b)
et je calcule l'horizon optique
depuis le mont Mc kinley soit 4828 m
l'horizon optique est : 272.8 km   => il est donc évident que l'on peut voir " the observer " depuis le mont Mc kinley

calcule de l'horizon optique depuis l'observateur " the observer " ( qui se trouve a 2089 ft soit 636 m )
l'horizon optique est : 99 km il est evident que l'on ne peut pas voir entièrement  le mont Mc kinley

mais en prenant la formule H = D*D / ( 2 * R )

avec D = 225.3 - 99 km
on trouve H = 1250 m

donc depuis " the observer " on peut voir  le mont Mc kinley a partir de 1250 m

we can see mount Mc kinley above 1250m

you pass over, because that's the name of the game they are playing with you.

yes

[gravityblock]

Grab some popcorn... 

Gravock