Maapallon kiertoliikeMaa kiertää AurinkoaNettilähteitäSun, Earth, and Moon in Motion Explore a model of Earth’s yearly revolution around the sun. Discovering Physical Geography (Flash- animaatioita): Earth as Viewed from the Sun Orbital View Sun Angle and Length of Day The Angle of Incidence Earth-Sun Geometry and Ancient Humans Yö ja päivä ovat yhtä pitkiä jo ennen kevätpäiväntasausta Reasons for the seasons – Rebecca Kaplan (Tekstitys suomeksi: Antti Miettinen) Seasons and Ecliptic Simulator – Basic Coordinates and Seasons – NAAP Olemme talvella lähinnä Aurinkoa | Suomen Luonto Airmail postage stamp of Fujeira (UAE), Johannes Kepler`s birthday 400th anniversary, 5 riyals, 1971; By scanned by User:Nickpo (own collection) [Public domain], via Wikimedia Commons Airmail postage stamp of Fujeira (UAE), Johannes Kepler`s birthday 400th anniversary, 5 riyals, 1971; By scanned by User:Nickpo (own collection) [Public domain], via Wikimedia Commons Airmail postage stamp of Fujeira (UAE), Johannes Kepler`s birthday 400th anniversary, 5 riyals, 1971; By scanned by User:Nickpo (own collection) [Public domain], via Wikimedia Commons Airmail postage stamp of Fujeira (UAE), Johannes Kepler`s birthday 400th anniversary, 5 riyals, 1971; By scanned by User:Nickpo (own collection) [Public domain], via Wikimedia Commons Airmail postage stamp of Fujeira (UAE), Johannes Kepler`s birthday 400th anniversary, 5 riyals, 1971; By scanned by User:Nickpo (own collection) [Public domain], via Wikimedia Commons Airmail postage stamp of Fujeira (UAE), Johannes Kepler`s birthday 400th anniversary, 5 riyals, 1971; By scanned by User:Nickpo (own collection) [Public domain], via Wikimedia Commons Kepler’s model of the planetary orbits as Platonic solids. [Public domain], via Wikimedia Commons Kepler’s model of the planetary orbits as Platonic solids. [Public domain], via Wikimedia Commons Kepler’s model of the planetary orbits as Platonic solids. [Public domain], via Wikimedia Commons Kepler’s model of the planetary orbits as Platonic solids. [Public domain], via Wikimedia Commons GE1 Sininen planeettaAarne Hagman; Kurssin rikastusmateriaalia 20136.8.2013