I can hardly see the screen.. but it’s math right ?
Wind power are very noisy actually horizontal axis wind turbines are mounted near the ground surface causing more noise than vertical axis.
No pollution since it's renewable source.
We don't use it in cities but in vast empty areas.
Yeah , it's not available all the time as it depends on wind and no human has power over that.
Answer: full whenever it is on the opposite side of the Sun from Earth
Explanation:
Galileo observed that <u>Venus presented phases</u> (such as those of the moon) together with a variation in size; observations that are only compatible with the fact that Venus rotates around the Sun and not around Earth.
This is because Venus presented its smaller size when it was in full phase and the largest size when it was in the new one, when it is between the Sun and the Earth.
In other words: When Venus is in its full phase it is not possible to observe it from the Earth because always in this phase, Venus, the Sun and the Earth are in conjunction (or aligned). This means the Sun is between Venus and Earth, in the orbit that both planets describe around this star. Therefore, seen from the Earth, the Sun covers Venus.
This fact along with other discoveries were presented by Galileo to the Catholic Church (which supported the geocentric theory at that time) as a proof that completely refuted Ptolemy's geocentric system and affirmed Copernicus' heliocentric theory.
Exogenic is the answer for the first. Endogenic is the answer for the second.