Olbers' Paradox - A Level Physics
Using parallax / triangulation to measure large distances in astronomy: from fizzics.org
宇宙での距離はどうやって測るのか？－ユアンセン・ティン
Stellar parallax
Greek Physics: Calculating the distance to the Sun and Moon
Electric Fields - A Level Physics
Stationary Waves & Phase - A-level Physics
Electromagnetism - Part 1 - A Level Physics
Nuclear Physics - A Level Physics
Parallax Angle
