Earth, Moon, and Sky

 

Figure 4.1 Southern Summer. As captured with a fish-eye lens aboard the Atlantis Space Shuttle on December 9, 1993, Earth hangs above the Hubble Space Telescope as it is repaired. (credit: modification of work by NASA)

If Earth’s orbit is nearly a perfect circle (as we saw in earlier chapters), why is it hotter in summer and colder in winter in many places around the globe? And why are the seasons in Australia or Peru the opposite of those in the United States or Europe?

The story is told that Galileo, as he left the Hall of the Inquisition following his retraction of the doctrine that Earth rotates and revolves about the Sun, said under his breath, “But nevertheless it moves.” Historians are not sure whether the story is true, but certainly Galileo knew that Earth was in motion, whatever church authorities said.

It is the motions of Earth that produce the seasons and give us our measures of time and date. The Moon’s motions around us provide the concept of the month and the cycle of lunar phases. In this chapter we examine some of the basic phenomena of our everyday world in their astronomical context.

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Ferely Medina

Title of talk:

Hormonal Contraception, risks and Side Effects- My Personal Testimony

Bio:

Ferely Correa born in Venezuela, married and mother of 5, met her husband when they were studying engineering. They now share the same profession as chemical engineers. Previously, Ferely was working as a chemical analyst in Venezuela and Mexico in the oil and gas industry, then moved to Holland, and there, volunteered as a team coordinator of activities related to the expat areas in the Hague, at ACCESS magazine. Currently, she is blessed to be part of the NFP instructors in USA, teaching the Billings Ovulation Method. Teaching has taken her on a rewarding and beautiful journey learning more about her body, how it works and what could potentially damage it.