Eclipse and transit

oriel36

https://theskylive.com/planetarium?objects=sun-moon-mercury-venus-mars-jupiter-saturn-uranus-neptune-pluto&localdata=51.48%7C0%7CGreenwich%2C+United+Kingdom%7CEurope%2FLondon%7C0&obj=sun&h=10&m=25&date=2021-06-10#ra|5.236871175158189|dec|23.019512598537958|fov|50

Just as the moon is passing in front of the Sun in its orbital motion of the Earth, Mercury is passing between the slower moving Earth and stationary/central Sun in retrograde motion moving from left to right-

https://sol24.net/data/html/SOHO/C3/96H/VIDEO/

Because Mercury shows its largely dark hemisphere to us as it passes between our planet and the Sun, it is barely discernible against the background stars in contrast to the dazzling display when Mercury shows its bright hemisphere to us when in direct motion and travelling behind the Sun-

https://www.youtube.com/watch?v=w2uCtot1aDg

I don't mind being banned from the weather or astronomy forums as they are full of intellectual tinsel and unable to appreciate the solar system properly so this place is as good as any.

oriel36

It should go without saying that someone who adores solar system research will also appreciates environmental concerns for a cleaner atmosphere, ocean and countryside.

In a week or so, the North Pole will turn towards its point midway to the dark hemisphere of the Earth, thereby creating the largest circumference where the Sun remains constantly in view otherwise known as the Arctic circle-

https://www.youtube.com/watch?v=-OgLCH7jYp8&t=15s

All planets create these expanding and contracting circles from Equinox to Equinox with the largest expanse on the Solstice-

https://calgary.rasc.ca/images/planet_inclinations.gif

A planet with an inclination furthest from the orbital plane has also the smallest circle and therefore the rate of change between seasonal conditions for each hemisphere is negligible or quite small.

A planet with an inclination closest to the orbital plane like Uranus creates a massive circle equivalent to the Arctic/Antarctic circle almost close to each other. The effect of this inclination is a more active rate of change in seasonal conditions as the circle expands and contracts rapidly between the Equinoxes.

This is planetary climate on a solar system scale, there is also geographical climate (maritime, continental, ect) but really nobody makes the distinctions or the experimental theorists have tried to make the Earth's system's fit into conditions found in a garden greenhouse.

oriel36

The faster moving Earth is presently overtaking the slower moving Jupiter and Saturn so over the coming months they will be seen to fall behind in view (retrograde motion) as they did over 20 years ago as the Earth passes them by in our mutual orbit of the Sun-

https://apod.nasa.gov/apod/image/0112/JuSa2000_tezel.gif

On the other hand, the faster moving Mercury is also in retrograde motion, however, the distinction here is far more nuanced-

https://apod.nasa.gov/apod/image/0112/JuSa2000_tezel.gif

Mercury moves faster than the change in position of the background stars from left to right of the central/stationary Sun. The change in position of the stars parallel to the orbital plane is due to the orbital motion of the Earth, however, as Mercury moves faster than the Earth, the inner planet can be seen moving faster as it passes between the slower moving Earth and the central Sun-

https://www.theplanetstoday.com/

A satellite tracking with the Earth around the Sun now allows what was previously called direct/retrograde motions to be partitioned depending on what planets are moving faster and slower than the Earth.