Full source for astronomytonight.net, a site for amateur astronomers. The site has basic astronomy data for any location, and weather data for specific countries (the US and Canada). Customizable for your observing location.
License: BSD 2-Clause "Simplified" License
At minimum, dragging should be supported, to change the center.
I cannot get the OpenLayers tool to talk successfully to the MET Office Datapoint server, for the weather radar.
Ref: http://stackoverflow.com/questions/41526983/openlayers3-wmts-out-of-memory-error
I applied the fixes mentioned above. Now it's failing again.
"javax.servlet.context.tempDir" should be all lower case. This was working before only by accident. The directory lookup returned a blank string, translated into the root of the file system.
Cause: I changed the country id in code a while ago. I failed to change it in all places.
The rendering on Apple devices isn't very good. The rendering on the canvas element is particularly bad. Is this because of the retina display changing the scale?
This makes use of another project, the 'planisphere' repo.
Three.js is a tool for rendering 3D graphics. It requires WebGL support from the browser.
This is simply so that shared links will retain the lang setting.
In the mechanism for pre-populating forms with the most recent data, I inject raw request params into the DOM, as part of hidden input controls in a form. (These recycle back to the original form.) That injected data is not escaped, so there's likely a problem with cross-site-scripting there.
There are bugs...
This is quite a bit of work.
The main output page has the option of rendering the output in French.
The output of the MICA tool, for daily phenomena, is English only.
Given the regularity of the output, it's likely possible to automate the translation of its text (at least most of the time).
Inspired by the Edmund Mag 5 star atlas.
The main output page has the option of rendering the output in English or French. That is not 100% implemented.
There are comments on the appearance on the Messier objects. Those should be translated into French by a native speaker. The English version of these comments are taken from the Observer's Handbook of the Royal Astronomical Society of Canada. (Which is credited on the site's home page, by the way.)
Show the apparent size of the Sun.
Show the apparent size and phase of the Moon. Show the polar angle of the crescent's axis.
At the moment, the Moon is shown as a simple small dot. At times of occultations, the star being occulted is being shown a small distance away from this dot.
On the main output screen, where all the data is listed, add navigation from the satellite image to the large version, under /satellite/graphic.sky. Use a double-click, I suppose.
At present, when the user views data for a location in another time zone, the times (and some dates) are erroneous. This is a result of how, by default, javascript treats time zones.
Do we do anything about this? Or leave it alone?
When an occultation is shown in a chart, by following a link from the main page, the rendering is off. The star is not close enough to the Moon's limb. It's off by ~20-40 minutes of time.
I checked the raw calc in ephem.js for the core calc of topocentric positions, and it seems ok (to within about 1 arcmin). The function EPH.apply_parallax_to_αδ(eph, wh) also seems ok.
So the bug is likely elsewhere. Size of the moon? Position of the star? The calc in code.js for the changes to ra, decl due to parallax?
A bug in ephem.js. The logic for accounting for the difference between UT and TT was not applied in all the branches that it should have been.
The MICA tool generates listings of daily phenomena. Strangely, no eclipses are included. That data needs to be added manually.
The search-replace of the URL is not 100%.
Keep an eye out for when they decide to implement CORS on their server.
When they do, go directly to their server, instead of using mine as an intermediary.
In comparison with the values in the Observer's Handbook.
The form on the main page has the option of using the device's current location. That is failing on my Android 5.1 Nexus 7 tablet. When the button is pressed, nothing happens.
The code should allow for N languages, not just English and French.
The impl should allow reuse of one JSP for rendering results in N languages.
There are weird-character / encoding issues with the tag files.
Example: set the computer clock to 2017-09-05 07:21 in the morning, Eastern Time Zone. No rectangle for the Moon appears in the observation window. The Moon is full, transits at 00:59:42.
When curves are drawn on the canvas element, the rendering can be patchy, with parts of the curve missing.
There's a good technique described in the Observer's Handbook for calculating fairly precise positions over a limited time span (about a year). (See page 22, in the 2017 Handbook.)
The idea is to use two osculating orbits, taken for 2 specific moments, separated by ~6 months. For other moments, just use linear interpolation/extrapolation to get a good approximation to the orbit. This technique has a max error of ~2-3 arc seconds over a limited time span.
This algo is already mostly implemented. The exception is the Earth/Sun, where the current impl uses a mean orbit (less accurate). The problem, of course, is that the loss of precision for the Earth's position propagates to the calculated position of all the other planets. In other words, the Earth is the weak link in the chain here.
The fix needs :
It's as if their impl has N servers, and some servers include a CORS header, and some don't. I've seen the forecast appear, but with the current conditions absent.
The site uses the traditional symbols for the planets, as seen in old astronomical almanacs. Using those symbols has the advantage of being very curt - they take minimal space.
On a Samsung device, I've saw these symbols appear with colored backgrounds, with a different color for each planet. It didn't look very good.
Example: main page, listing of planets has links to a chart. I click on Mercury's link. The chart shows, but with no icon or text for Mercury in the center. A few minutes later, the bug is not reproduced. Doesn't seem to be common. (I saw it with the default location, at about 9:05pm EDT 2017-07-17).
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