Hubble Parameter
Basic cosmology This discussion will cover basic geometry of the cosmos. I will cover expanding space, Hubble law, three possible versions of the Big Bang Theory from two points of […]
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Triffid Nebula M20
This nebula was discovered by Charles Messier in 1764. It is a combination of an open cluster and emission nebula. The name means “divided into three lobes”. In the center […]
Whirlpool Galaxy M51
Whirlpool Galaxy Also known as M51a and NGC5194. The smaller galaxy in the lower right is a companion galaxy known as NGC5195 or M51b. First discovered by Charles Messier in […]
Astronomical Events
The Ideal Teacher
ESSAYS AND ADDRESSES ON EDUCATION by GEORGE HERBERT PALMER and ALICE FREEMAN PALMER I THE IDEAL TEACHER In America, a land of idealism, the profession of teaching has become one […]
Golden Ratio φ
The Golden Ratio The topic of φ will be discussed in several posts. This post will show basic definition, derivation and some interesting relationships. The ratio φ is one of […]
How to determine local sunrise and sunset
Sunrise Sunset A question many people ask me is how do you calculate local sunrise and sunset. In order to proceed you need an understanding of how the earth moves […]
Quadratic Equation
Algebra This is the derivation of an equation we all know. The equation: (1) As a solution to this: (2) STEP 1, set the coefficient of the first […]