Crepuscular Rays @icansciencethat

Uploaded May 2024 | Updated September 2026, 1 week ago

Let's do a little exercise to explore how YOU think about crepuscular rays.

Source Material:
upload.wikimedia.org/wikipedia/commons/thumb/9/91/Crepuscular_rays_with_clouds_and_high_contrast_fg_FL.jpg/1280px-Crepuscular_rays_with_clouds_and_high_contrast_fg_FL.jpg

pickpik.com/fog-tree-mood-sun-beyond-god-109741

upload.wikimedia.org/wikipedia/commons/thumb/1/18/Crepuscular_rays_over_Plymouth_Sound.jpg/1280px-Crepuscular_rays_over_Plymouth_Sound.jpg

upload.wikimedia.org/wikipedia/commons/thumb/1/17/Sunset_clouds_and_crepuscular_rays_over_pacific.jpg/1280px-Sunset_clouds_and_crepuscular_rays_over_pacific.jpg

$Why is perspective? Perspective means things look smaller in the distance, but WHY? What causes perspective? jump ahead: @0:00 Intro @1:07 Perspective is based on simple principles @1:46 Refraction is different from perspective @2:05 Begin with a point light source @3:01 A pinhole camera (diagram) @5:33 Deriving the equations from the diagram @7:35 Forced perspective example @8:28 Deriving the equation for apparent height vs distance @10:27 Angular size @12:03 Equation for angular size @12:30 Curved horizons are not perspective @12:50 Other false claims about perspective @13:41 Rebuttal: Vision is light hitting your eyes @14:06 Rebuttal: Bending light is called refraction - not perspective @14:21 Rebuttal: Orthographic views are not dishonest @15:20 Rebuttal: Accurate graph of apparent height vs distance including perspective @15:25 Rebuttal: What compression actually means in this context source material: How To Draw Using 1-Point Perspective by Circle Line Art School: https://www.youtube.com/watch?v=XRrKohWdpeQ Forced perspective photography with action figures by Wire Hon: https://www.instagram.com/WireHon/ Lake Pontchartrain Transmission Lines Nikon P900 (3/3) - (Flat Earth Debunked) by Soundly https://www.youtube.com/watch?v=kADO7nkt-rk Lens Compression Doesnt Exist - Heres Why by Fstoppers: https://www.youtube.com/watch?v TTXY1Se0eg My previous video on experimental investigation of perspective: https://www.youtube.com/watch?v=n9co3x6Fdbc$

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$Generalized Sagnac Effect Part 1 A brief dip into the mathematics behind this paper by Ruyong Wang, Yi Zheng, and Aiping Yao, 2004: https://arxiv.org/ftp/physics/papers/0609/0609235.pdf In this video, we disregard index of refraction of the fiber optic cable and merely estimate (under classical, pre-Einstein) dynamics what the phase shift for the apparatus should be and why. Spoiler Alert: Its the speed of the FOG relative to the cable. Working the problem in this way lets us avoid the question of SR vs non-SR and show it works either way$