Astronomy Weekly Newsletter - Friday, November 28, 2014

Astronomy newsletter

Top new questions this week: How do you calculate the effects of precession on elliptical orbits? Kepler's first law states that planets (and all celestial bodies orbiting another body) travel in elliptical orbits, which have well-known formulas that make it relatively easy to calculate the ... orbit   asked by HDE 226868 5 votes answered by David Hammen 3 votes How is the maximum density in a circumstellar disk determined? I'm working with some equations to model the evolution of a circumstellar disk. One of the equations is $$\rho(r)=Ce^{-\frac{(r-r_{peak})^2}{2 \sigma ^2}}$$ where $\rho$ is density, $r$ is the ... disk   asked by HDE 226868 2 votes answered by Michael B. 1 vote Effect of the absence of atmospheric refraction to sun rise and sunset times What is the effect of absence of atmospheric refraction on sin rise and sunset time? Is it will be delayed or earlier for sunrise and sunset, and why? Thank you:) sun atmosphere   asked by user9686 2 votes answered by Wayfaring Stranger 0 votes How does this strategy for chasing the sunset work? In Randall Munroe's What If? blog he tackles this question: What is the longest possible sunset you can experience while driving, assuming we are obeying the speed limit and driving on paved ... sun earth   asked by curiousdannii 2 votes answered by iantresman 0 votes moonless night and lunar phase How to define moonless night? There is no moon at all during some night? How to calculate and know whether the moon would appear during one night? If the lunar phase is full moon, is it possible ... lunar phase   asked by questionhang 2 votes answered by dotancohen 3 votes speed of light measurement While searching for different methods of speed of light measurement, i came across one of the method of fizeau discussed below which i cannot fully understand. In short,in Fizeau's apparatus, a beam ... light speed   asked by user65445 1 vote answered by LDC3 1 vote What range of exit pupils work for observing the full moon? I'm observing the full moon, from a major city, with heavy light pollution and dust. The objective size is fixed, for this comparison, something between 4 and 6 inches. The question is about the ... moon telescope binoculars light-pollution   asked by Kartick Vaddadi 1 vote Greatest hits from previous weeks: Why don't stars move in the night-sky as the moon does? I want to know why don't we see a change in the position of stars during the night while we do see a change in the position of the moon. I've checked other online sources and some answers say that it ... moon earth   asked by Jihed Jaouabi 1 vote answered by TildalWave 9 votes Does the Sun rotate? The planets rotate as an after effect of their creation, the dust clouds that compressed span as they did so and the inertia has kept it rotating ever since. It's fairly easy to prove that planetary ... sun   asked by RhysW 39 votes answered by Manishearth 46 votes Can you answer this? stellar evolution fortran code-runge kutta mass step from center to fitting point I am trying to integrate the four stellar model equations from the core to a fitting point and from the surface to the fitting point (xf).When I start the outward integration however i have to use a ... stellar-evolution   asked by tzakara 1 vote

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