If you are not satisfied by the comprehensive information contained within the book Earth Not a Globe, feel free to do the following:

Step 1. Look outside your window

Step 2. Read the FAQ

Step 3. Read the FAQ again

Step 4. Read the book "One hundred proofs the Earth is not a Globe" by William Carpenter

Step 5. Read the back-issues of Flat Earth News Quarterly

Step 6. Read the book "Flatland" by Edwin A. Abbott

Step 7. Read The book "The terrestrial plane" by Frederick H. Cook

Step 8. Read the book "Universal gravitation a universal fake" by Charles S. DeFord

Step 9. Read the book "Does the earth rotate?" by William Edgell

Step 10. Read the book "Earth not a globe: scientifically, geometrically, philosophically demonstrated" by Henry J. Goudey

Step 11. Read the book "The book of light" by Gilbert Johnson

Step 12. Read the book "Unpopular truth against popular error in reference to the shape of the earth." by Charles W. Morse

Step 13. Read the book "A challenge from the earth-flattening society" by Richard A. Proctor

Step 14. Read the book "The Earth: A Plane" by John E. Quinlan

Step 15. Read the book "He knew earth is round, but his proof fell flat" by Robert J Schadewald

Step 16. Read the book "The view from the edge; on the necessity of the flat earth" by John P. Sisk

Step 17. Read the book "Is the earth a whirling globe?" by Carl Albert Smith

Step 18. Read the book "Answers to the common 'proofs' that the earth is a globe" by Chester M. Shippey

Step 19. Read the book "In defense of the square peg." by Irving Wallace

Step 20. Read the book "The shape of the earth; some proofs for the spherical shape of the earth given in astronomical and geographical text-books examined, and shown to be unsound" by Arthur V. White

Step 21. Read the book "The Flat Earth and her moulder" by Ossipoff H. Woofson

Step 22. Come to the conclusion of a Flat Earth

100 proofs written in 1881

Flatland written in 1884

Does the earth rotate? written in 1919

Universal gravitation a universal fake in 1931

Earth not a globe written in 1930

The book of light written in 1890

Unpopular truth against popular error in reference to the shape of the earth written in 1913

A challenge from the earth-flattening society written in 1883

The Earth: A Plane witten in 1906

He knew earth is round, but his proof fell flat written in 1973

The view from the edge; on the necessity of the flat earth writtin in 1979

Is the earth a whirling globe written in 1918

Answers to the common 'proofs' that the earth is a globe written in 1930

In defense of the square peg. written in 1957

The shape of the earth; some proofs for the spherical shape of the earth given in astronomical and geographical text-books examined, and shown to be unsound. written in 1909

The Flat Earth and her moulder writtin in 1884

Only two of those books come after space travel... SHUT THE HELL UP