Photographs purporting to show the curvature of the Earth are always suspect because virtually all camera lenses project an image that suffers from barrel distortion. To accurately assess curvature from a photograph, the horizon must be placed precisely in the center of the image, i.e., on the optical axis.

2019年10月20日 · If you have a perfect visibility condition, your camera is completely leveled, there is no fish-eye distortion... On a 4K camera at 10 km height, the Earth curvature it will be 2% -> 36 pixels on 3840 pixels wide. If you are interested on it, that is not the way. Human eye can not perceive clearly the Earth Sphericity at a commercial flight ...

2018年1月6日 · An unobstructed horizon such as an ocean horizon dips below the horizontal due to Earth's curvature. The dip of the ocean horizon is noticeable from a height of 10 meters. So it is not necessary to be at high altitudes to notice Earth's curvature.

2020年5月12日 · Web Mercator is just a Mercator that considers the Earth approach by an sphere, not a ellipsoid. That is much easier, needs less computation as, the curvature in a sphere is constant it is not required to consider. Mercator projection is ok for navigation (that is what you are doing with Google Earth or Google Maps). Check this link.

2023年3月7日 · The higher I go the more of the earth curvature I will begin to notice. Call the left most point in my field of vision on the horizon A and the right most point B, how would you calculate how many meters do A and B go below an imaginary straight line?

Can an explosion be felt in the ground on the opposite side of the Earth like from an asteroid? Would planes in the air on that side of the Earth be able to survive? Does the shock waive follow the ground or will the curvature of the Earth limit the shock wave? Related: This is from a broad question that I am breaking up in 3 questions. Feel ...

2022年12月8日 · Could it be, that centrifugal force is just the "static" centrifugal force due to earth's rotation and the other components are distributed along linear and quadratic terms, where the quadratic terms are called "curvature forces" and the linear ones "Coriolis". Something here is not consistent with my textbook knowledge I learned in the past.

2015年6月17日 · Alternative earth models and their origins are awesome to review. The ignorant adherence to the flat earth model in the 21st century is sad. Looking at the material cited for the 'Bedford Level experiment' it's clear to me that those still using Rowbotham's formula have another fundamental problem aside from refraction distortion.

2016年3月10日 · Using an Earth Curvature Calculator, sunlight at the horizon travels through ~120 miles of 'dense' atmosphere (ie has an altitude <2 miles). That will fall off rather quickly the higher above the horizon the sun is.

2017年9月23日 · You think the 'curvature' is simply referring to the trajectory curvature radius. Yeah, that depends on what OP's was rally asking about. 2 issues I have with this answer: 1.) ijk coordinates are an already locally co-rotating system, therefore they're not inertial, and not identical to the inertial system $\vec{e}_x,\vec{e}_y,\vec{e}_z$.