Recent content by TheSource007

Is that just the fundamental theorem of calculus? And also, is there any method to find the root that does not involve a first trial of alpha? Thanks

Could you refer me to sources where they explain more on the iterative methods that can do this sort of problem? I have no experience in finding a numerical value for an unknown that appears inside an integral (and inside the limits for that matter)

Homework Statement Hi everyone. I have encountered a weird equation while doing some research and I have no idea how to solve it. The equation goes like this ∫ dR / (1+ c*r) ^ (a/r) = d, limits of integration are from 0 to Rmax, where Rmax ^2 = [u]^2 - α^2, where u is a constant value...

Hi all. I have a question. Is there a way to calculate the altitude and azimuth of a star at a given time using as an input the altitude and azimuth of that star at an earlier time, without having to convert those coordinates to RA and DEC? The problem is that I want to calculate the position...

Thanks a lot. I used the same formula for both coordinate systems and I got approximately the same result.

Hi all. I have been looking for a formula that gives me the angular separation of two stars. So far I just found this one :http://www.skythisweek.info/angsep.pdf but it uses the RA and DEC of the 2 stars, and I need to use the hour angle and DEC. Is it the same thing? Do I just replace HA by...

I figured it out. Thanks

It doesn't seem to be working. When I run the test.bat file it says that it cannot find the program. Are my procedures suppose to have a different format from .pro for it to work? I might be doing something wrong. What language are those batch files? Even though I've only used IDL for about 2...

I am using Windows 7

Ok, but say I do it this way: the input file has HA, DEC, then execute the first procedure, an it will print the ALT, AZ on the input file. How can I command the code to read the ALT, AZ for the first procedure? For example I can have the HA, DEC in the first row. How do I print the ALT, AZ on...

Hi all. This is my problem. I have two IDL procedures hr2altaz, hour, dec, alt, az -- which takes the HA and DEC and converts it to ALT and AZ altaz2hr, hour, dec, alt, az -- which takes ALT and AZ, and converts it to HA and DEC. What I need to do, is to begin with a certain HA and DEC...

Homework Statement I have a problem. I need to prove that the divergence of Einstein tensor is 0 using the bianchi identities. I have looked to several sources and I have derived an answer, but I don't fully understand some steps. Homework Equations I have uploaded a document which shows a...

I updated my post. Eq 2 means the gradient of the tensor F. Does your equation dw means the same? Because it seems to me as the differential, and w being a scalar... As I said (in my update) I am very new at this. Thank you.

Homework Statement I attach a word document with the equations because I don't know how to write them on the post. My question reads: Show that Maxwell's equations Eq (1) is equivalent to Eq (3).Homework Equations The first term of Eq 1 reads: F sub alpha beta comma gamma. That means partial of...