แล้วไปที่ไหน

แล้วไปที่ไหน

ผลลัพธ์ (อังกฤษ) 1:

Where did you go

ผลลัพธ์ (อังกฤษ) 2:

Note that addresses here are abbreviated, because you are already logged onto "Stargazers."
Thus the home page is Sintro.htm
not http://www.phy6.org/stargaze/Sintro.htm

"Stargazers" contains more material than can ever be covered in a regular class. Still, teachers need a wider knowledge, allowing them to pick and choose material according to circumstances, and to mention odd tidbits without detailed discussion, just to create interest.

And some very lucky teachers may sometimes find in class a kid or two who really want to find out more. Such students can be directed here to satisfy their interest.

This overview focuses on three items:
---what are Kepler's laws, what do they mean, and why are they important.

The laws were formulated between 1609 to 16l9, and are (as usually stated):



Planets move around the Sun in ellipses, with the Sun at one focus
The line connecting the Sun to a planet sweeps equal areas in equal times.
The square of the orbital period of a planet is proportional to the cube (3rd power) of the mean distance from the Sun
(also stated as-- ...of the "semi-major axis" of the orbital ellipse, half the sum of smallest and greatest distances from the Sun)

ผลลัพธ์ (อังกฤษ) 3:

Where to go