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"What is now proved was once only imagined."


Mar
14
awarded  Yearling
Feb
3
awarded  Popular Question
Dec
21
comment How do I calculate the right ascension of the points along the ecliptic at given elevations?
Where do those lines meet? At the sphere's center or at the horizon? In any case I don't have $A$ (at least not readily). But the diagram is helpful: given $a$ relative to the horizon (celestial elevation) and a time (which ultimately gives $A$, but I'm not sure of the calculation — that's a part of the solution I'm looking for, perhaps), I'm looking for $b$ (or better, $b$ measured from a fixed reverence, such as 0 RA).
Dec
20
comment How do I calculate the right ascension of the points along the ecliptic at given elevations?
@CarlWitthoft: Not sure. But what I've got is $t$ and $X$. In fact lots of $t$s; hundreds or even thousands. So I'm looking for an *algorithm*. I also have most other basic ephemerides (rise, set, transit, etc.; and can do coordinate transforms relatively easily); but what I need is to know what the formula is; or how to extract $RA(X, t)$ ultimately from the ephemerides I have, even if indirectly as $RA(f(X), g(t))$ where $g$ and $f$ are some ephemerides.
Dec
20
comment How do I calculate the right ascension of the points along the ecliptic at given elevations?
@CarlWitthoft: I've got solar position. What I have is time and a desired elevation; what I'm looking for is is the function used to calculate the point along the ecliptic at that elevation at that time.
Dec
20
comment How do I calculate the right ascension of the points along the ecliptic at given elevations?
I'll try. But if I could draw it I think I could solve it. In the meantime: At the time the sun sets, t, working eastwards along the ecliptic, how far do you have to go (i.e., what is the RA) of the point that is X degrees above the horizon? Ho do you calculate RA given X and t?
Dec
20
accepted Does the length of the sidereal day vary systematically?
Dec
20
accepted When is the right ascension of the mean sun 0?
Dec
20
asked How do I calculate the right ascension of the points along the ecliptic at given elevations?
Dec
16
comment Probability and the many-worlds interpretation
Could you have a look at this question. I think your added comments are relevant there and might produce an answer.
Dec
9
awarded  Enlightened
Dec
9
awarded  Nice Answer
Nov
21
comment Do consciousnesses get “scattered” across the many worlds of the MWI?
@BenCrowell: Yes, I saw that (good) question, but didn't really get the answer.
Nov
21
comment Do consciousnesses get “scattered” across the many worlds of the MWI?
It sounds like what I feared is unavoidable: I need to learn measure theory!
Nov
21
comment Do consciousnesses get “scattered” across the many worlds of the MWI?
Thanks. That helps me focus the question better (see updated question). I understand that all individuals must see the same a priori probability of ending up in a universe where a given event has occurred. What I'm trying to get at is whether any two given pre-event consciousnesses (in the single pre-event universe) end up in the same post event universe, or even in the same kind of post-event universe.
Nov
21
revised Do consciousnesses get “scattered” across the many worlds of the MWI?
Correct confusion about individual universes and classes of universes.
Nov
21
revised Do consciousnesses get “scattered” across the many worlds of the MWI?
Correct confusion about individual universes and classes of universes.
Nov
18
comment Do consciousnesses get “scattered” across the many worlds of the MWI?
@Sophia: I didn't realize I had said that. (Is this about discomfort with MWI? That's not the question at hand.)
Nov
18
comment Do consciousnesses get “scattered” across the many worlds of the MWI?
@Sofia: FWIW, this is what started my train of thought.
Nov
18
comment Do consciousnesses get “scattered” across the many worlds of the MWI?
@Sofia: What does MWI say?