Planetary Science
Apparent Depth: Formula, Definition, Diagrams, and Examples
Lecture 5: Stellar Distances
Measuring Objects in the Sky: Angular Size & Distance - Lesson
Apparent size of an object, class 10
Measuring Objects in the Sky: Angular Size & Distance - Lesson
Calculating the size of the Sun and the Moon from angular size and distance
Small Angle Formula Imaging the Universe - The University of Iowa
Understanding Astronomy: The Sun and the Seasons