View Issue Details
ID | Project | Category | View Status | Date Submitted | Last Update |
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0001529 | SkyChart | 1-Software | public | 16-04-05 22:13 | 16-11-27 17:39 |
Reporter | Sasa | Assigned To | Patrick Chevalley | ||
Priority | normal | Severity | trivial | Reproducibility | always |
Status | resolved | Resolution | fixed | ||
Platform | Linux 64-bit | OS | Kubuntu | OS Version | 14.04 |
Product Version | 3.11 SVN | ||||
Target Version | 4.0 | Fixed in Version | 3.11 SVN | ||
Summary | 0001529: Details form - some suggestions | ||||
Description | For some trivial calculations I use following site use approximate methods: http://www.esrl.noaa.gov/gmd/grad/solcalc/ According to that, the value for "Hour angle" in CDC is at least not divided by 15 ( it is shown in h:m:s format). Distance from Earth in AU is shown up to 4 decimals, which is too small, at least for Sun. As well, additional value in km may be useful to show (for accuracy testing at least). Angular diameter value perhaps may be with 2 decimals at least. | ||||
Tags | No tags attached. | ||||
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Hi Sasa, Hour Angle is show in hours, so degree divided by 15. I not find this value in the mentioned web page, can you be more explicit? Agree to improve the distance display. The AU value require 9 digits for a precision of 1 km. But I also thing it is good to display the km value and maybe in this case it is not valuable to show the AU value with more than 5 digits. For the planets 0.1 arcsec precision on the diameter is probably sufficient. For the Moon and Sun I can replace the display in minute by mm'ss.s" |
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Sorry for being unclear... Hour angle value is a bit weird to me. Upper NOAA link use javascript low precision methods for calculation (main.js) and values calculated for sunset and sunrise hour angle are definitely different than CDC shows in these specific moments of times. As well, Stellarium show significantly different value than CDC. All upper indicate some problem or my misunderstanding... Regarding distances. I would suggest displaying AU with precise 9 decimals as well as precise value in km (with 3 decimals). There is plenty of space to display it precisely it can be. NASA JPL live simulator show live distance from Earth to tracked planet in km only, which I though is interesting feature for CDC. I have forgotten as well to suggest to display more precision for magnitude value. In general, there is no reason to truncate values in this form if they are calculated with precise methods. |
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Revision 3332 increase the display precision for the planet distance: https://sourceforge.net/p/skychart/code/3332/ I not increase the precision for the planet magnitude because this is a very crude estimate that not take account for the planet feature albedo. The hour angle of an object is simply the local sidereal time minus the object right ascension. It is 0 when the object is at the meridian and increase to the west. To compare rise or set time you must be very careful on how the refraction is counted by each software. |
Date Modified | Username | Field | Change |
---|---|---|---|
16-04-05 22:13 | Sasa | New Issue | |
16-04-06 13:45 | Patrick Chevalley | Note Added: 0003348 | |
16-04-06 13:45 | Patrick Chevalley | Assigned To | => Patrick Chevalley |
16-04-06 13:45 | Patrick Chevalley | Status | new => feedback |
16-04-06 13:45 | Patrick Chevalley | Target Version | => 4.0 |
16-04-06 16:13 | Sasa | Note Added: 0003351 | |
16-04-06 16:13 | Sasa | Status | feedback => assigned |
16-04-06 16:19 | Sasa | Note Edited: 0003351 | |
16-11-27 17:39 | Patrick Chevalley | Note Added: 0003446 | |
16-11-27 17:39 | Patrick Chevalley | Status | assigned => resolved |
16-11-27 17:39 | Patrick Chevalley | Resolution | open => fixed |
16-11-27 17:39 | Patrick Chevalley | Fixed in Version | => 3.11 SVN |