## Lesson 8

Kepler’s Second Law In this 13 minutes video, you will be introduced to the Second of the three laws of Johannes Kepler. This mathematical treatment of the law, makes clear about the changes in velocities at different places in the elliptical trajectory, and explains why the planets are faster at perihelium. Watch the video, byContinue reading “Lesson 8”

## Trivia 5

Constellations are patterns of stars that can be recognized in the sky. Surely you are acquainted with the constellations of the zodiac, the ones that appear in the ecliptic: Pisces, Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpius, Sagittarius, Capricornus, and Aquarius. This 12 constellations were recognized in the nocturnal sky since ancient times, andContinue reading “Trivia 5”

## Lesson 7

In this video you will follow up with the Orbital angular momentum-continuation from last lecture. The presentation is made in Spanish. I was taping the presentation in Spanish, and after I realized it was already advanced that I decided to finished it in Spanish language. So, but an English speaking person can follow it also.Continue reading “Lesson 7”

## Lesson 6

The Orbital Angular Momentum The orbital angular momentum is a very important concept that has physical consequences for a body revolving around another, like planets around the stars, or moons around the planets. In this lesson, we are exploring what the orbital angular momentum is, and developing an expression for the one problem body problemContinue reading “Lesson 6”

## Inspiration for scientists

Reading from the book of Michael White, Isaac Newton-The Last Sorcerer-p.82 at start of chapter 5, I found the following inspirational reflection of Werner Heisenberg. “It is probably true quite generally what in the history of human thinking the most fruitful developments frequently take place at those points where two different lines of thought meet.Continue reading “Inspiration for scientists”

## Lesson 5

In the literature we find that, to calculate the distance in parsecs (pc) to a particular star, we need to know the parallax angle in seconds of an arc, and determine the reciprocal of it. The question I would like to explore in this lesson is, the why do we do this. Look at theContinue reading “Lesson 5”

## Lesson 4

In Lesson 1 you can follow the definition of the Astronomical Unit based on a “test” particle, that takes to revolve around a major body, exactly one year. We saw, that based on this definition, the Earth’s distance from the Sun is slightly smaller, compare with the test particle’s distance around the Sun. The resultContinue reading “Lesson 4”

## Lesson 3

This lecture can be used as for college level students. To continue with the understanding of Kepler’s laws, the presentation is a build up of the Physical-Mathematical concepts of the 2-Body problem and reduced mass. It culminated with the deduction of the total energy for the reduced mass system. The results will be used inContinue reading “Lesson 3”

## Trivia 4

THE SOLAR SYSTEM -BASIC There are many stars in the universe that host planets; those are also solar systems like the one in which we dwell, some with more, and some with less planets revolving around the star. That does not mean that we have found life in those planets found around other stars, becauseContinue reading “Trivia 4”

## Astrodidactics

A Place to Learn about Physics and Astronomy My name is Peter Krumbein, I have a Licenciatura in Physics from the National Pedagogical University, Bogota/Colombia, and studied Physics at the University of Hamburg, Germany. I have a Master in Physics Education, from Andrews University, Michigan, and Master in Astronomy and Astrophysics from Valencia International University,Continue reading “Astrodidactics”