42: That’s a long time in a Spanish toilet
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What is the Moon? The Moon installation touring the UK that inspired this episode (Museum of the Moon) Awesome simulated view of the Moon over 1 month (Wikipedia) Why do people say the Moon is made of cheese? (Mental Floss) Five myths about the Moon (EarthSky) Man in the Moon (Wikipedia) Ancient Greek astronomy (Wikipedia) Eratosthenes measurement of the Earth's circumference (Wikipedia) Aristarchus's 3rd-century BCE calculations on the relative sizes of the Sun, Earth & Moon (Wikipedia) The lunar calendar (Wikipedia) The Celtic year (Living Myths) The death & life of the 13-month calendar (City Lab) What causes the seasons? The Earth's tilt, which is theorised to be caused by a cosmic crash that created the Moon (NASA) La Luna, Belinda Carlisle (YouTube) "A moon is an object that orbits a planet or something else that is not a star. Besides planets, moons can circle dwarf planets, large asteroids, & other bodies" (National Geographic) The Moon (Wikipedia) Earth's moon (NASA) Origins of 'luna' (Online…