Tag Info

New answers tagged

0

I'm pretty sure that weeks are seven days long because in ancient times people worshipped the sun, moon and the five then-known planets. The days are even named after these in various languages...


4

The concept of a month derived from the amount of time it takes for the moon to cycle from new moon to new moon (which is roughly 29.5 days). The modern month has experienced changes from this original concept due to trying to fit a standard number of months within a solar year. If you divide the lunar month into quarters, each quarter is approximately 7 ...


2

For computer software, the easiest way to take a sphere (and/or hemisphere) and flatten it into a flat shape (usually a rectangle) is the equi-rectangular projection (also known as the plate carrée), because it has the simplest formula relating pixels and coordinates: $x = w*\lambda/360 + w/2$ $y = -h*\phi/180 + h/2$ x and y is the pixel point w and h ...


0

Astrophotography is always a good step to take after just observation. That way, you can see things through your telescope that you cannot see with the naked eye, and also share your findings. Another thing you could do is start on a different part of astronomy, maybe getting a hydrogen alpha filter or a solar telescope to observe the Sun, which again ...


2

This is a variant of pi, or "pomega". In LaTeX, you can get it by using \varpi $$\varpi$$ TeX has a question on the 'var' prefix, and Wikibooks has something relevant. The various forms of pi are present in Unicode as: U+03A0 Π greek capital letter pi (HTML Π · Π) U+03C0 π greek small ...


0

The answer is there on the stjarnhimlen.se site and also stargazing.net. Now we can compute the Sun's altitude above the horizon: sin(h) = sin(lat) * sin(Decl) + cos(lat) * cos(Decl) * cos(LHA) LHA = LST - RA h=Altitude=30$^\circ$, LHA = Local Hour Angle, lat= Your latitude on Earth, Decl = Object's declination, Ra = Object's right ascension, and ...



Top 50 recent answers are included