Recent content by theneedtoknow

Awesome, thank you! I needed it more as a hypothetical for a short story I'm writing so it's OK if it doesn't happen on single human lifescales :)

If I was looking at a self-luminous object, and all of a sudden a great pass appeared directly between me and the object, in the line of sight between me and it, I could potentially see an Einstein ring. Q: If that mass then started moving radially towards me (distance to self-luminous source...

I have been analyzing some data at work, and I have measured the occurrence rates of some event. How do I give a one sigma confidence interval to go along with it, assuming it is a Poisson event? For example, I found that something occurs 20 out of 10 000 times, something else occurs 43 out of...

Thank you so much for the help!

Sorry, not thinking very clearly. I meant to type the set of unit vectors which are PARALLEL to that same plane

If I have a vector nhat = [nx, ny, nz] which is normal to some plane, how can I write the vectors (I assume there are infinitely many) which are perpendicular to that plane?

I love every album on your list, good taste in music!

Hard to pick just 5, given that I am a major music junkie, but they most likely are: Cibo Matto - Stereotype A Cibo Matto - Viva la Woman Depeche Mode - Violator Leftfield - Leftism Moloko - Do you like my tight sweater?

A couple of good, low budget ones are Harrison Bergeron and Thomas in Love

Try Cronocrimenes (Time Crimes), fun sci-fi flick

I called (and still call her) baba

I have a bunch of spectral images of a star taken at various points in the Earth's orbit. I have used IRAF to determine the heliocentric corrections necessary. I am trying to get a rough estimate as to the difference between these heliocentric corrections, and what a barycentric correction would...

Thank you! Would you happen to know of any textbooks where this is derived? I have the Landau and Lifgarbagez "Mechanics" one and they do not do so.

I know that, for time-independent potentials, we have E=sum (Vi*partial dL/dVi) - L What if one or more of the potentials are time-dependent? Is the relationship between energy and the lagrangian then "total dE/dt = - partial dL/dt "?

I am trying to find some sky surveys that have longitudinal data of star magnitudes. The passband does not matter. All that matters is that stars has been observed periodically for a decent amount of time (no surveys with only 9-10 observations per catalogue object). Sadly, the only ones I know...