The path of the moon in the sky
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The path of the Moon in the sky. The second most striking astronomical object. If we observe the position of the Moon in the night sky, what do we find?. Instant gratification concession: Any opinions (guesses) on where you can find the Moon in the sky?.

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The path of the moon in the sky

The path of the Moon in the sky

The second most striking astronomical object


If we observe the position of the moon in the night sky what do we find

If we observe the position of the Moon in the night sky, what do we find?

Instant gratification concession: Any opinions (guesses) on where you can find the Moon in the sky?



Phases of the moon and position of the sun they are not independent
Phases of the moon and position of the Sun…they are not independent!

Full moon is 180 degrees away from the Sun on the sky, Question: where in the sky will the full moon be at midnight?



Understanding the geometric reason for the phases of the Moon allows us to immediately understand new pictures from distant spacecraft


Where do we find the moon in the nighttime sky

Where do we find the Moon in the nighttime sky? Moon allows us to immediately understand new pictures from distant spacecraft

In which constellations do we find it? Does it move along the ecliptic?


The path of the moon in the sky1
The path of the Moon in the sky Moon allows us to immediately understand new pictures from distant spacecraft


The line of nodes of the moon s orbit
The line of nodes of the Moon’s orbit Moon allows us to immediately understand new pictures from distant spacecraft



How do we explain all of this

How do we explain all of this? yourself!

What is the “physics” of the solar system which produces all of these observed phenomena?

It took the human race tens of thousands of years to reach the right answer


The existence of the ecliptic

The existence of the ecliptic yourself!

The Earth and the other planets orbit the Sun, in nearly the same plane for all planets



February 3 yourself!

May 3


Why we see the sun projected against different constellations at different times of the year
Why we see the Sun “projected against” different constellations at different times of the year


Then why is the ecliptic tilted with respect to the celestial equator the reason for seasons

Then, why is the ecliptic tilted with respect to the celestial equator (the reason for seasons)

Answer: the obliquity of the ecliptic (or more simply “obliquity”, or even more simply, “tilt of the Earth’s axis”)


Northern hemisphere in winter celestial equator (the reason for seasons)

Northern hemisphere in summer


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