How do we know the Earth Rotates? Sometimes we think to have a good argument to teach that the Earth rotates by just looking at the sky and watch the stars moving around “us” from East to West, to conclude that the Earth rotates from West to East. That is all right, but it inContinue reading “Trivia 12”
Author Archives: pkrumbein
Lecture 12
Harmonic Motion Bodies in a circular path around a center undergo harmonic motion, whit a good approximation applied to the planets around the Sun and moons around planets. In this video we are going to determine the differential equation and give a solution to calculate the resonance gaps in the Asteroid Belt. The lecture isContinue reading “Lecture 12”
Trivia 11
Ursa Major – Osa Mayor The names of the Big Dipper stars are indicated in the picture by the arrows. Their respective distances from Earth are indicated in light years (ly), and the HIP Catalog numbers. You may use Stellarium for example, and in the search window write the HIP number, and the star willContinue reading “Trivia 11”
Albert Einstein- mi idolo
Un personaje favorito para muchos es Albert Einstein. ¿Será porque era un gran físico, o porque era un filósofo de la naturaleza, profundo e introspectivo, o ambos? O, ¿será sencillamente porque aparece en tantas pancartas, fotos, pinturas y publicaciones en libros para científicos y para niños y niñas, que perciben este personaje como un inspiradorContinue reading “Albert Einstein- mi idolo”
Trivia 10
The Ecliptic Following the path of the Sun around the eclipse, helps us to understand the four seasons and the nocturnal sky, in a rhythms that affects our life. Watch the video. http://www.showme.com/sh?h=xVhwWNk
Education and Religion
It is fascinating to read in the history of the sciences how knowledge was increasing thanks to the inquisitory mind of the human being. The curiosity to understand and rationally explain natural phenomena led to the creation of a scientific methodology that responds to the way we learn. Observation is, without a doubt, the firstContinue reading “Education and Religion”
Lesson 11
Total Orbital Energy The total orbital energy in a gravitational bound system is a constant. It will be the same calculated at aphelio as well as perihelium. The total energy will be equal to 1/2 <U> the time-average potential energy of the system. The symbol < > is an indication for the average over oneContinue reading “Lesson 11”
Lesson 10
Starting with the fact of the Second Law of Kepler, and using the result of the Orbital Angular Momentum as a constant value in terms so the reduced mass and the eccentricity of the ellipse, the Third Law of Kepler can be shown. The square of the period of a planet is directly proportional toContinue reading “Lesson 10”
Trivia 9
How do we orient ourselves in the sky? In the following video I will explain that every object in the sky has an “address” given by two numbers: Right Ascension (RA) and Declination (DEC). It is similar to how we locate cities on the Earth globe, using latitudes and longitudes, as we saw in theContinue reading “Trivia 9”
Trivia 8
The Earth globe is going to help us understand how we may locate objects in the Celestial sphere. A brief review of how we locate places (cities, lakes, etc.) on the Earth, will help us. This is elementary for most of you, but a review does not hurt. The sphere is divided in two hemispheresContinue reading “Trivia 8”
AstroDidactics 