Re: First attempt at UCAC5 support
On Mon, Nov 22, 2021 at 10:50 AM dulle < dulle@...> wrote: I made a first attempt at implementing ucac5 support.
Thank you for working on this contribution!
I will follow up with further conversation over on the pull request you?have opened. (But anyone without a GitHub account is free to try out your code and reply right here on the mailing list if they want!)
Your screenshot is very impressive ¡ª the star names look to be centered exactly on the star images themselves!
For anyone who needs the link, I found the pull request here:
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First attempt at UCAC5 support
Hi,
I made a first attempt at implementing ucac5 support.
Now, as epochs and proper motion management go, I am a bit lost
(1997, 2000 and 2015 epochs are involved...)
so I have inserted CHECKME FIXME UCAC5 wherever it is relevant
for knowledgeable people to check how to properly work this out.
I checked a field against the results given by the vizier
online interface at ;
as far as I can tell, it looks ok right now (it might slightly degrade in the future if proper motions are not properly (no pun intended) dealt with).
And attached is a screenshot of a field around ngc7009 with ucac5 stars
tagged.
(Pull request opened)
If you want to give it a go before it is merged in the main repo,
its available here :
Best,
--
fm
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On Sun, 12 Apr 2020, Mike Chapman wrote: Hi,?
Has anyone used UCAC5 with XEphem? ?I've half hearted tried by obviously it's hard coded,
just looked at the code. ?The version of XEphem I'm using will read UCAC4, unfortunately
for myself UCAC4 has some problems in the southern hemisphere. The version of XEphem I'm
using is 3.7.7 released August 9 2015. ?Is this the latest version? This version does read
UCAC4. ?I'm looking through the code for patchlevel '3.7.5-RC9' and it's obvious that the
format of the 'unf' file changed from 'unf3' to 'unf4'. ?I tried copying the 'unf5' file
to 'unf4' but no luck obviously there's some versioning aspect inside the 'unf' file. ?So
what to do? Has anyone solved this?
Cheers,
Mike Chapman _._,_._,_
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Re: Documentation error - URL to discussion of gamma of display is forbidden
Well that's cheating, just the way I like it. But thanks to your help, now I've nothing to try it with -- for now :-)
Best.
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Re: Documentation error - URL to discussion of gamma of display is forbidden
I found it on the internet archive here:
Now suppose I wanted to propose a change to this. Pardon my ignorance of all things git but is that what a ¡°pull request¡± is? (What a strange name!). If so, I¡¯ll take this as an opportunity to get started with git if someone can point me at info on how to do this.
Alas, I¡¯ve already made the update, using the MIT link in?David¡¯s other email. But, yes, a pull request (despite the odd name) would be the invitation you would issue for the main repository, if it wished, to ¡°pull¡± your improvement over into the official project source code history.?
For future?reference, I think that these days it's possible to even skip the agony of learning "git", and to visit the file on GitHub:
¡ª and to click the little pencil icon in the upper right whose tooltip is "Edit this file". I've heard a rumor that it allows you to create a quick pull request by simply making an edit through the web, though I've never tried it myself.
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Re: Documentation error - URL to discussion of gamma of display is forbidden
On Sun, 21 Nov 2021, David Kirkby wrote: Youngsters will probably not know what a CRT is! ... to the delightment of their spine :) -- Fran?ois Meyer
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Re: Documentation error - URL to discussion of gamma of display is forbidden
I found it on the internet archive here:
The same document is at
I assume from the first part of the URL, the author has changed the university he works at.
I tried several websites discussing the subject, but the one you gave seems to get to the point the quickest, although that document is a bit dated, with discussion of CRTs.Youngsters will probably not know what a CRT is!
Wikipedia seems to be particularly bad on the subject, as it discusses the mathematics at the top, and only near the bottom does one see images showing the problem!
Dave
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Re: Documentation error - URL to discussion of gamma of display is forbidden
I found it on the internet archive here:
Now suppose I wanted to propose a change to this. Pardon my ignorance of all things git but is that what a ¡°pull request¡± is? (What a strange name!). If so, I¡¯ll take this as an opportunity to get started with git if someone can point me at info on how to do this,
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Documentation error - URL to discussion of gamma of display is forbidden
This is a report of a documentation error - or at least one for me based in the UK. It may or may not be for those in the USA or elsewhere.Section 4.3.2 Moon Control menu
Set Earthshine...
it says:
This value depends on the gamma of your display. A fine discussion
of display gamma and a test image with which you can determine the
gamma value of your own display may be found at the URL: .
I get a "Forbidden:
You do not have permission to access the requested address (URL)."
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Re: Can I change the default location?
One more comment: it is not expected that you ever need to edit XEphem X resources files manually. Doing so is likely to eventually cause trouble. Always use the Save mechanism, that's what it's for.
On the other hand, XEphem is now a community project, so if you feel differently, you are free to change it! But think long and hard, XEphem has 40 years of experience behind its design decisions so you would be wise to at least first examine the documentation to understand what is there now before hacking away. Yes, I know I'm still clinging to my baby -- I can't help it!
Cheers,
Elwood
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Re: Can I change the default location?
Or perhaps your question was how to make this the new default. Since XEphem is meant to be an exploratory research tool, it never changes the defaults automatically. This allows you to explore without concern about messing things up too badly if you just want to start over.
To make any change(s) the new defaults, see section 8.3.
Summary in this case (of changing Site):
Click Preferences -> Save
Note Main -- Basics is marked, click the box to expand
Note several specific sub resources are marked
You may browse click/unclick any resources in the tree as desired for saving
To save the marked values as new defaults click Save now
?
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Re: Can I change the default location?
An alternative way is to include XEphem's X resources in the file
XEphem which is e.g. located in the hidden .xephem directory in
the user's home directory (/home/<user name>/.xephem). The
file XEphem can include a lot of settings for fonts and colours
used, directories searched, default catalogues to be loaded etc.
Many of the settings can be accessed by the Preferences menue in
XEphem's main window. I use the following settings for my default
site (change them to your values):
XEphem.Elevation:??????????????????????????? 200 m
XEphem.Lat:????????????????????????????????? 50:00:00
XEphem.Long:???????????????????????????????? -10:00:00
XEphem.Sitename:???????????????????????????? My city
XEphem.TZName:?????????????????????????????? MEZ
XEphem.TZone:??????????????????????????????? -1:00:00
Regards,
Martin
On 20.11.21 19:55, Brandon Rhodes
wrote:
On Sat, Nov 20, 2021 at
11:33 AM David Kirkby < drkirkby@...>
wrote:
Is there any way to get
the program to default the location to my location in the
UK, rather than in the USA?
Yes! You can specify it in your .Xdefaults or .Xresources
file:
I am a bit surprised that the Reference doesn't mention
that, since otherwise I have no idea how I myself discovered
it! I'll double check the documentation again this weekend,
and add something about X resources if it is really
undocumented at this point.
-
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Re: Can I change the default location?
On Sat, 20 Nov 2021 at 18:55, Brandon Rhodes < brandon@...> wrote: On Sat, Nov 20, 2021 at 11:33 AM David Kirkby < drkirkby@...> wrote: Is there any way to get the program to default the location to my location in the UK, rather than in the USA?
Yes! You can specify it in your .Xdefaults or .Xresources file:
I am a bit surprised that the Reference doesn't mention that, since otherwise I have no idea how I myself discovered it! I'll double check the documentation again this weekend, and add something about X resources if it is really undocumented at this point.
? I checked the documentation where? it shows how to add a site. It really needs explaining there how to make a specific site the default site. Maybe it is documented elsewhere in the documentation, but even if it is, I think it needs to be in the section showing how to create a site, or a link to where it is documented.
Dave
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Re: Can I change the default location?
See Section?2.3.1.1.
Summary:
Click the current site.
Scroll to your desired city then click then click Set.
If it's not in the list, click Create, fill in the fields, then click Set.
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Re: Can I change the default location?
On Sat, Nov 20, 2021 at 11:33 AM David Kirkby < drkirkby@...> wrote: Is there any way to get the program to default the location to my location in the UK, rather than in the USA?
Yes! You can specify it in your .Xdefaults or .Xresources file:
I am a bit surprised that the Reference doesn't mention that, since otherwise I have no idea how I myself discovered it! I'll double check the documentation again this weekend, and add something about X resources if it is really undocumented at this point.
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Can I change the default location?
I built XEphem on Ubuntu 20.04 LTS.? Under "Local" I always see Chicago, Illinois. I've defined my location as "Althorne" and can select that site if I press Chicago, Illinois. But it is a PITA to have to set my location back to Althorne every time I start the program. Is there any way to get the program to default the location to my location in the UK, rather than in the USA?
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Re: Is there an azimuth where the moon will not be?
Yes, and it depends. Just like the sun, the ¡°no-go¡± azimuths change through out the year. Here is a diagram that shows many of the variables at work. In case the diagram doesn¡¯t make it here is the url
? What of those are variables, and what are fixed? The inclination of 5.144 degrees, does that mean its
a) Always constant at 5.144 degrees b) Changes from -5.144 to +5.144
c) Changes from 0 to + 5.144
From what I understood from others, from my latitude (around 51 degrees north), the moon will never be north.?
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Re: Is there an azimuth where the moon will not be?
Yes, and it depends. Just like the sun, the ¡°no-go¡± azimuths change through out the year. Here is a diagram that shows many of the variables at work.
In case the diagram doesn¡¯t make it here is the url
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Re: Is there an azimuth where the moon will not be?
North will work fine for your az stop.
But although XEphem will compute all things lunar, with the kind indulgence of the other members of this group I would like to mention another program I wrote that provides additional info just for ham operators called ?It also provides doppler shifts for 2m and 440 which are critical for reliable moon bounce and the information is available via a simple tcp socket for utilization by other control programs.
Good luck with your project.?
73, Elwood, WB0OEW
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Re: Is there an azimuth where the moon will not be?
Good luck!
73 de WB6PIO
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On 11/18/21 1:38 PM, David Kirkby wrote: On Thu, 18 Nov 2021 at 23:27, <randolf0klein@... <mailto:randolf0klein@...>> wrote:
XEphem can give you azimuth and elevation for the moon at any time and create a list of positions for intervals of your choosing easily. But to answer your initial question, just like the sun, the moon will never be in the north (to be precise that is only true on the the northern hemisphere 5? inside the tropic of cancer and the arctic circle, i.e. between ~29? N and ~ 61? N). Thank you, that's great. I used to be interested in astronomy as a child, but taking the telescope in/out of the house got a bit laborious, and the condensation on the mirrors. So I lost interest. The moonbouce project at the radio club has certainly shown the need to know a bit more about astronomy.
Dave
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Re: Is there an azimuth where the moon will not be?
XEphem can give you azimuth and elevation for the moon at any time and create a list of positions for intervals of your choosing easily. But to answer your initial question, just like the sun, the moon will never be in the north (to be precise that is only true on the the northern hemisphere 5? inside the tropic of cancer and the arctic circle, i.e. between ~29? N and ~ 61? N).
Thank you, that's great. I used to be interested in astronomy as a child, but taking the telescope in/out of the house got a bit laborious, and the condensation on the mirrors. So I lost interest. The moonbouce project at the radio club has certainly shown the need to know a bit more about astronomy.
Dave
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