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Re: Moon phases,solver
that's my guess too, I am looking for a (simplified) model to visualize that.
But I am stuck to this: there are three bodies,sun,earth and moon; two of them on the ecliptic plane; in case of a new moon the angle separation sun-observer-target of the projection of the moon on the ecliptic plane should be 0 in my thinking; but it is not. At what point I am wrong? Spherical trigonometry? sorry for a not so clear description ... |
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Re: Moon phases,solver
Am Freitag, 10. Februar 2023, 11:58:43 CET schrieb s.bortolussi@... via
groups.io: Thanks Mathias. Just a guess: the orbit of the moon around the earth, and the orbit of the earth around the sun, are not on the same plane - so a separation of 180° would be quite rare, if possible at all. If you go by the separation angle, don't search for 0° and 180°, just search for minimum and maximum. Cheers MH -- Mathias Homann Senior Systems Engineer, IT Consultant, IT Trainer Mathias.Homann@... (email,XMPP) @mathias:eregion.de (Matrix) LinkedIn: keybase: gpg key fingerprint: 8029 2240 F4DD 7776 E7D2 C042 6B8E 029E 13F2 C102 |
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Re: Moon phases,solver
Am Freitag, 10. Februar 2023, 09:43:27 CET schrieb s.bortolussi@... via
groups.io: Hello, I write to ask some "directions for use". the full moon for the current month is easily found in the calendar panel, but I'm guessing you'Re aiming for finding the dates for next month as well? in that case, use moon.phase - 100 is full moon, 0 is new moon. Cheers MH -- Mathias Homann Senior Systems Engineer, IT Consultant, IT Trainer Mathias.Homann@... (email,XMPP) @mathias:eregion.de (Matrix) LinkedIn: keybase: gpg key fingerprint: 8029 2240 F4DD 7776 E7D2 C042 6B8E 029E 13F2 C102 |
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Moon phases,solver
Hello, I write to ask some "directions for use".
To reckon the next new or full moon date I use the solver tool. I set? "Moon.Sep" or "Moon.Elong" as the function and check "Find Minimum" or "Find Maximum" goal.
Here my questions:
- is this the correct way to do it?
- why the separation values are not 0 or 180 degrees at every new or full moon? Can you explain or point me to sources/models where to visualize the dynamics of involved bodies (in plain style if possible ...). If I am not wrong "Topocentric" or "Geocentric" setting does not change this too much.
Thanks in advance,
best regards
stefano |
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Ideas for using XEphem in the classroom?
Dear friends of XEphem,
I am seeking your opinion about how I could overhaul the astronomy practical work that I've had with my Bachelor students for quite a few years. They are in a curriculum for would-be school teachers (for pupils aged 3-11) thus this has to be scientifically robust though basic and very applied. I am not dreaming that some day they might use XEphem with the children (though, who knows?) but at least that this course gives them a minimal background. I would like to modify it in-depth to better correspond to the historical buildup of knowledge over the centuries... I mean, starting as far as possible from sky observations, and I would also like to introduce some basic calculations (whereas in the current version, they use the Solar system view right at the beginning and that is not really an observation that one could make in real...). I am for example thinking of the calculation of the Earth's radius... What do you think about it? Any suggestion or constructive criticism is welcome! N.B. it is a Google translation of my document in French, that I quickly reviewed but not thouroughly polished... Yours, Maxime |
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Re: Installs fine with Linux Mint 21.1 (Kernel: Linux 5.15.0-56-generic)
The previous build runs fine on Mageia 8. Mageia 9 is still at the
alpha stage. When (if) it reaches beta level, I will run some new tests with the new version. Anything that runs on PclOS usually runs fine on Mageia. Doug. On Mon, 2 Jan 2023 12:45:35 -1000 "Bernie Walp" <duckbill@...> wrote: This does not pertain immediately to Maxime's question, but I can |
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Installs fine with Linux Mint 21.1 (Kernel: Linux 5.15.0-56-generic)
This does not pertain immediately to Maxime's question, but I can report an effortless new installation on a new computer using Linux Mint 21.1 (Kernel: Linux 5.15.0-56-generic).
toggle quoted message
Show quoted text
Bernie On 1/1/23 23:52, Jakob via groups.io wrote:
Hello Maxime, |
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Re: Problem after Ubuntu 20.04-->22.04 upgrade
Hello Maxime,
I think you need to recompile xephem, to get the libraries right. This is what I did (on Ubuntu 22.10): xephem: apt install build-essential groff-base libmotif-dev libssl-dev libxext-dev libxmu-dev libxt-dev Then: follow xephem/INSTALL cd xephem/GUI/xephem make clean make ./xephem -> works! Replacing your old binary by the newly compiled one might be enough (not sure). Hope this helps - Jakob. Cheers - Jakob. |
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Problem after Ubuntu 20.04-->22.04 upgrade
Dear friends of XEphem,
I have the impression that the upgrade from Ubuntu 20.04 to 22.04 has messed up my XEphem install. I am no longer able to launch it from a terminal as I used to (xephem &), instead I get an error message: "xephem: error while loading shared libraries: libssl.so.1.1: cannot open shared object file: No such file or directory". Is there any simple way to fix this? Or should I reinstall XEphem from start (and if so, what shall I do to first remove it properly)? Thank you for your help and clear skies for 2023! Yours, Maxime |
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xorg libXp support status
---------- Forwarded message --------- From: Alan Coopersmith <alan.coopersmith@...> Date: Mon, Sep 12, 2022 at 1:52 PM Subject: [ANNOUNCE] libXp 1.0.4 To: <[email protected]> Cc: <[email protected]> This library provides support for X11 clients to print via the X Print Extension, as previously implemented in the Xprt server.? X.Org removed support for the Xprt server from the xorg-server releases in the 1.6.0 release in 2009, and the standalone git repo it was moved to has been unmaintained since 2009, making it difficult to actually use this library. While X.Org has continued to maintain this library for binary compatibility, we do not plan to do so for the long term and encourage anyone still building or shipping it to investigate how to stop doing so going forward as we now consider it to be deprecated. Adam Jackson (1): ? ? ? Fix a memory leak on the error path in XpGetLocaleNetString Alan Coopersmith (9): ? ? ? Update README for gitlab migration ? ? ? Update bug URL for gitlab migration ? ? ? Build xz tarballs instead of bzip2 ? ? ? Fix spelling/wording issues ? ? ? gitlab CI: add a basic build test ? ? ? XpNotifyPdm.c: fix -Wmisleading-indentation warning ? ? ? XpExtVer.c: fix -Wredundant-decls warning ? ? ? Add deprecation notice to README ? ? ? libXp 1.0.4 Emil Velikov (1): ? ? ? autogen.sh: use quoted string variables Mihail Konev (1): ? ? ? autogen: add default patch prefix Peter Hutterer (1): ? ? ? autogen.sh: use exec instead of waiting for configure to finish git tag: libXp-1.0.4 : 05e46af1ccb68f1752cca5879774a4fb9bf3b19fe088eb745034956e0c6fadba? libXp-1.0.4.tar.gz SHA512: a04018707bd8933c93c04f88361855d9f8129550fd5730befb5a0d5c4747ffe4b82630b80670f3cc718f0abd601e0e0927d6000b2fc32c9985db320b75cc59bb? libXp-1.0.4.tar.gz PGP:? : 1f19e3b8e82a34a8fd9889a7d9af0abe8588cb03fb57c37c569634cf3b9df1a4? libXp-1.0.4.tar.xz SHA512: 50e82e7ee7222db13a04f6223ae8653eb783593c3b28825d7fc233af188960bec53d2b11ced281e01140d283d840d0e3822d71f95f5045d594fb704485fd0f89? libXp-1.0.4.tar.xz PGP:? -- ? ? ? ? -Alan Coopersmith-? ? ? ? ? ? ? ? ?alan.coopersmith@... ? ? ? ? ?Oracle Solaris Engineering - |
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Re: Revisiting XEphem for Mac
Hi! чт, 25 авг. 2022 г. в 03:45, Trane Francks <trane@...>:
XEphem 4.0.1 available via MacPorts for x86_64 macs:? With best regards, Alexander |
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Re: Revisiting XEphem for Mac
? The current revision of XEphem on GitHub is 4.1.0. That revision will compile without libXp, however I don't know if all dependencies upon libraries not available for macOS have been excised. I've encountered no difficulties building from source using Ubuntu-20.04 LTS, but don't have access to a Mac to see how things go in that environment.
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Revisiting XEphem for Mac
开云体育Hi, gang. This morning XQuartz reminded me that there's a new version (2.8.2) to which to upgrade. Alas, because versions later than 2.7.11 remove libXp, XEphem won't compile on macOS with a modern XQuartz. libXp dependence in XEphem should be removed and replaced with a modern lib for any missing functionality; otherwise, we're at risk of being left behind. Unfortunately, it's way beyond my skill set to even analyze the code and figure out where such functionality is used. Cheers! trane --
// // Trane Francks trane@... Tokyo, Japan // Practice random kindness and senseless acts of beauty. |
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Re: OpenSSL version to link 4.1.0 against on Solaris 10
开云体育Lutz M?ndle wrote:
Have a look at netmenu.c in <xephemroot>/GUI/xephem. Thanks!? I'll take a look at that. -- Jeff Wieland jjwieland@... |
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Re: OpenSSL version to link 4.1.0 against on Solaris 10
Have a look at netmenu.c in <xephemroot>/GUI/xephem.
Change the following code at line 87 na beyond: ???????? ssl_method = SSLv23_client_method();??? /* deprecated since openssl 1.1.x */ //??? ??? ssl_method = TLS_client_method();??? /* since openssl 1.1.x */ to // ??????? ssl_method = SSLv23_client_method();??? /* deprecated since openssl 1.1.x */ ??? ??? ssl_method = TLS_client_method();??? /* since openssl 1.1.x */ Hope that helps. |
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OpenSSL version to link 4.1.0 against on Solaris 10
I see that xephem 4.1.0 now needs some version of OpenSSL.
I have my own build of OpenSSL 1.1.1q, but it won't link against that -- it has undefined symbols.? It will link with creaky old unsupported OpenSSL 1.0.2u.? What version should I be using? (Yes, I know that I might be the only person building this on SPARC Solaris.) -- Jeff Wieland jjwieland@... |
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Re: GRS longitude syst.II
开云体育The jupiter.2040 bdl file is available as all the other xxxx.2040 we sent to the new git site ...On 09/05/2022 21:48, Elwood Downey
wrote:
The jupiter.1020 bdl file is now out of date so the values are being computed using Meeus copyright 1982. The GRS has migrated several degrees away from the model built at that time. --
Serge Montagnac + GPG Key 0xDF083D7B +
Nature, Not Human Activity, Rules the Climate.
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