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QUESTION#1:
Around 22 June
QUESTION#2:
Around 22 December
QUESTION#3:
(1)Around 21 March 
(2) Around 23 September
QUESTION#4:
At these two points, the direct point of the sun is at the equator.
QUESTION#5:
(1) The Sun's highest altitude is 42°.
(2) There is about twelve hours the sun up on this day.
QUESTION#6:
(1)The Sun's highest altitude is 66°.
(2)There is about sixteen hours the sun up on this day.
QUESTION#7:
(1) The Sun's highest altitude is 42°.
(2) There is about twelve hours the sun up on this day.
QUESTION#8:
(1) The Sun's highest altitude is 19°.
(2) There is about eight and a half hours the sun up on this day.
QUESTION#9:
In summer, the sun's altitude angle is large (about 66 degrees in the summer solstice). The sun is close to the earth. The energy density of solar energy to the planet is very high. The ground gets more energy from the sun, so it is hot in summer. In winter, the sun's altitude angle is smaller (about 19 degrees in winter solstice), the sun shines obliquely on the earth, the energy density of solar energy reaching the ground is lower, the surface gets less energy from the sun, so it is cold in winter. Besides, the duration of summer illumination is longer than that in winter, increasing the length of sunshine means increasing the time that the sun provides heat to the earth. This is another reason why summer is hotter than winter.
QUESTION#10:
The Analemma
QUESTION#11:
Begin:Aug 25 10:10:00AM
End:Sep24   09:10:00AM
It takes about 30 days for the Moon to complete one cycle of phases and return to first quarter.
QUESTION#12:
The local time in Seattle when the Sun was most eclipsed on August 21, 2017 is 10:20:00 AM.
QUESTION#13:
The Solar Eclipse is an astronomical phenomenon formed on the earth when the moon completely obscures the sun.
When the moon moves around the earth to the middle of the sun and the ground, if the sun, the moon, and the universe are aligned or close to a straight line, the moon blockades the sunlight shining on the planet, and the dark shadow behind the moon falls on the earth, then the Solar Eclipse occurs.
QUESTION#14:
Because an eclipse requires the Earth, the Moon, and the Sun to appear in a straight line, the total solar eclipse requires the sun to be entirely obscured by the moon. Based on this, the center of the three-point connection between the Earth, the Moon and the Sun is in Mexico or Central America, so Mexico or Central America can see the total solar eclipse. In the United States, the eclipse is not visible because of its deviation from the center.
QUESTION#15:
An eclipse is a natural phenomenon. When the sun, the earth, and the moon are in the same straight line (the ground is between the sun and the moon), the light from the sun to the moon will be partially or entirely covered by the planet, resulting in an eclipse of the moon.
QUESTION#16:

https://www.thoughtco.com/lunar-eclipse-and-the-blood-moon-4135955
QUESTION#17:
When "Strat" is clicked, Mars orbits the Sun typically from west to east. But after a while, Mars began to change its direction of motion and began to orbit the sun from east to west. Finally, it returned to normal and began to orbit the sun from west to east.
This strange phenomenon is called Retrograde motion.