The astrolabe was basically a map of the stars, you could use it to navigate by connecting what stars you see and what stars are on the astrolabe. It was also important for religious groups that built their religion off the stars!
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Lighting kerosene lamps. Petroleum in the form of tar from oil seeps in the ground were used to seal boats and the roofs of houses.
answer
The President of the USA is not required to have ever held any office
or been elected to anything. A candidate's level of education or training
for anything is irrelevant, and it would be totally un-American to impose
any sort of religious test.
In fact, a candidate for president is not required to have any skills, talent,
ability, experience, or qualifications of any kind.
The only constitutional requirement is that the candidate will need to turn
35 years old by the time s/he takes office.