star

  1. A

    Calculating the extent of a star's orbit on the sky - need parallel functions?

    Hello! I wrote an N-body simulator that plots the orbit of stars and planets. I have set it up so that it plots the orbit, which is calculated at the centre of mass of the star, as well as parallel lines +- a stellar radii from the orbit, i.e. showing the extent of the star on the sky over...
  2. E

    Star photography, camera image scaling problem

    I want to find out what angle a pixel in the images which my camera produces represent. So I take pictures of two points (stars in the sky). The true angle between them is known beforehand. But the camera produces images where the pixels are rectangular, i.e. non-quadratic. They are more...
  3. V

    Metric, River Metric, Star Metric

    Prove that .... <picture attached>
  4. J

    Computing the mass of a neutron star from a planet's orbit

    A small planet orbits a static neutron star in a circular orbit whose proper circumference is 6 \times 10^{11} \ \mbox{m} . The orbital period takes 200 days of the planet's proper time. Estimate the mass M of the star. I'm assuming I should use the far field metric ds^{2} = -(1 -...
  5. J

    Proving sequence formula - stellar numbers problem

    Hi, I've been working on a project based upon the idea of 'stellar numbers'. That is, a number which, when represented as dots, can be arranged into the shape of a star with p vertices. This leads to a sequence for each value of p, for example when p is 6 (i.e. a six pointed star) the first five...
  6. H

    How do I turn a 3D Star Map into a 2D Grid Map?

    I don't know if this is the correct forum to post this in (I think the problem is related to Geometry), but here goes anyway. Ok, so I've been trying to create a kind of 2-Dimensional grid of the Stars which are closest to the Sun (see list here, if you don't know what I'm talking about). I'm...
  7. L

    Finding area of star in circle.

    Hi i need to find the area of the star only knowing the radius of the circle: r=1 For everything thanks in advance (Nod)
  8. H

    Magic Star

    I've been trying to work this out for ages but it's driving me nuts! (Angry) Any idea what belongs where the question mark is and why?
  9. R

    differential forms and Hodge star

    I am trying to figure out these relations (Hodge operator acts on the following r-forms) *(dx\wedge dy)=dz this one I do not get *(dy\wedge dz)=dx *(dx\wedge dx)=-dy how do they work? They only way I can explain it is that the wedge product work like the cross product for example...
  10. K

    sum of interior angles of a 7-point star.

    Dear sir , I would appreciate if anyone can show me the solution to the below question. thanks Kingman What is the value of the angles A+B+C+D+E+F+G in the beolw figure ?
  11. M

    alpha is a square of an element in Fq star

    if q be a power of an odd prime. we need to prove that an element alpha belongs to the multiplicative group Fq star, is a square element of Fq star if and only if alpha ^(q-1)/2 =1 . in particular -1 belongs to Fq star square if and only if q is congreunt to 1 (mod4). (Fq star is the...
  12. B

    For Star B state whether the star is closer than, farther, than, or exactly 10 parsec

    For Star B state whether the star is closer than, farther, than, or exactly 10 parsecs away? For Star B state whether the star is closer than, farther, than, or exactly 10 parsecs away? Star B: Apparent Magnitude:5 Absolute Magnitude: 4
  13. T

    Star Operator and Grammer

    I am not sure if this is where I can get help for it but I thought its worth a try. Prove that L = {a^n: n is a prime number} is not regular I was looking through the solution to it but don't understand it at all, could anyone help explain how to solve it? Thanks
  14. G

    Star Wars question...

    Greetings, New Poster. I hope this is the correct forum, if not, please point me to it. I am trying to determine two answers based on the statement: "For over a thousand generations the Jedi Knights were the guardians of peace and justice in the Old Republic. Before the dark times, before...
  15. P

    Kleene star 2

    Exhibit languages A and B such that neither is a subset of the other, but the kleene star of A=the Kleene star of B. How does that works? Any help will be appreciated.
  16. P

    Kleene Star

    The language L over the alphabet{a, b}: L={w|w begins with an a or ends with a b} Prove that L is not equal Lto the superscript +
  17. H

    star inscribed in a circle

    I am trying to answer this problem as a practice for an exam and I can't seem to find the correct answer. In a circle with a diameter of 10m, a regular five pointed star touching its circumference is inscribed.What is the area of the part not covered by the star. Please help me solve this.I...
  18. J

    5 pointed star

    what observations can you make about the sum of the angles of five pointed stars - How can you prove your observation? I know the sum of 5 pointed stars is 180 degrees. Other than saying you just add up the interior angles, is there another way I can offer "proof"?? THANK YOU!!
  19. S

    Star system changes

    Hi. This is not exactly my homework. It's for a webpage that I manage. We have a rating system for movies, and we just changed from 4 stars to 10 star system. So I was wondering if you could help me write a formula to change all the stars. So The problem is, the old system was 0 - 4 stars And...
  20. N

    star

    In this star diagram you have to use the numbers from 1-12 but cant use 11 or 7. The rows should add up to 34