Timeline for Can I use the parallax coefficients for observatories as a proxy for latitude using arctan2(sin, cos)?
Current License: CC BY-SA 4.0
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| Mar 12, 2021 at 23:24 | vote | accept | uhoh | ||
| Jun 17, 2020 at 9:47 | history | edited | CommunityBot |
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| Mar 23, 2020 at 23:03 | comment | added | uhoh | @DavidHammen I see what you mean and have revised accordingly | |
| Mar 23, 2020 at 23:02 | history | edited | uhoh | CC BY-SA 4.0 |
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| Mar 22, 2020 at 4:32 | comment | added | David Hammen | Re But why both sin and cos? That's the wrong question. The given values are $\rho\cos\phi'$ and $\rho\sin\phi'$, not $\cos\phi'$ and $\sin\phi'$ . The given values encode both radial distance and geocentric latitude. The right question is then why not radial distance and geocentric latitude? I don't know the answer to that question. An even better question is why not altitude and latitude? I don't know the answer to that question, either. (Note well: I used an unqualified "latitude" in my better question. Latitude without a qualifying prefix almost always means geodetic latitude.) | |
| Mar 22, 2020 at 3:17 | history | edited | uhoh | CC BY-SA 4.0 |
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| Mar 22, 2020 at 3:11 | history | edited | uhoh | CC BY-SA 4.0 |
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| Mar 22, 2020 at 3:08 | comment | added | uhoh | @astrosnapper I've fixed this answer and will read those soon, thank you! | |
| Mar 22, 2020 at 3:05 | history | edited | uhoh | CC BY-SA 4.0 |
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| Mar 20, 2020 at 19:26 | history | edited | uhoh | CC BY-SA 4.0 |
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| Mar 20, 2020 at 19:22 | history | undeleted | uhoh | ||
| Mar 20, 2020 at 19:18 | history | deleted | uhoh | via Vote | |
| Mar 20, 2020 at 16:25 | comment | added | astrosnapper |
The parallax coefficients are typically used when applying the topocentric corrections (for a given site on the Earth's surface as opposed to the geocenter). They let you form a 3d vector which can be combined with precession/nutation/frame bias matrix which is what describes the orientation between the celestial coordinate system and the CIO and the terrestrial reference and the TIO. Code examples include find_orb (search for rho_cos_phi) and SOFA cookbook
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| Mar 20, 2020 at 12:42 | history | edited | uhoh | CC BY-SA 4.0 |
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| Mar 20, 2020 at 12:37 | history | answered | uhoh | CC BY-SA 4.0 |