Duba wurin da ke ƙasa sannan ka amsa tambayar daga baya a cikin harshe ɗaya kamar yadda wurin yake:  Passage: Gangale asali ya zaɓi ƙarshen 1975 a matsayin zamanin kalanda don girmama shirin Viking na Amurka a matsayin farkon nasarar (Amurka) mai sauƙi zuwa Mars (a baya 1971 Soviet Mars 3 Landing ya ba da bayanai na dakika 15 kawai daga duniyar duniyar). A shekara ta 2002 ya karɓi Telescopic Epoch, wanda Peter Kokh ya fara ba da shawara a 1999 kuma Shaun Moss ya karɓa a 2001 don Kalandar Utopian, wanda yake a cikin 1609 don girmamawa ga amfani da Johannes Kepler na lura da Tycho Brahe na Mars don fayyace dokokin motsin duniya, da kuma Galileo Galilei na farko na Mars tare da na'urar hangen nesa. Zaɓin Telescopic Epoch don haka ya haɗa tsarin kalandar Darius da Utopian, sauran bambance-bambance da suka rage suna da suna. Har ila yau, yana kauce wa matsalar da yawa na telescopic lura da Mars a cikin shekaru 400 da suka gabata ana mayar da su zuwa ranakun da ba su da kyau.  Tambaya: A wace shekara ce Gangale ya zaɓi ya fara sanin shirin Viking na Amurka?
Shekara ta 1975