forked from FOSS/BangleApps
27 lines
2.5 KiB
Markdown
27 lines
2.5 KiB
Markdown
# Planetarium
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This planetarium takes your position and time and plots the sky as it is.
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No planets, or moon, only stars. It can show the 500 most brilliant stars in the sky.
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Plan is to show also constellations, but this is work in progress. Now it shows Taurus and Orion as examples.
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I think code is quite optimized already. It runs as fast as I could make it run. If someone has some ideas to speed it up, I could plot more stars.
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Basic equations to compute declination and right ascension for stars where taken from this [github repo](https://github.com/Michi83/planetarium). Thanks!
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## How to use
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The planetarium plots the stars as if you are looking to the sky (with your watch screen pointing downwards). This means, if you have the watch in your wrist, you have to look south to see the stars matching. If you want to look north, just take out the watch from your wrist and make a 180º turn.
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## Improvements
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I plan to add more constellations as soon as I have time. I am adding the constellations that I know of, but the plan is to add all the main ones (at least for North Hemisphere).
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Please note that the watch hardware is limited and computing the stars positions is a quite intensive task for this little processor. This is why it plots only stars and no planets or the moon. For plotting the planets, storage will be a limiting factor as well as computing the position for planets needs more initial data compared with stars.
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## Do you want to contribute?
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Maybe you want to add some more constellations to the planetarium. As you can see I didn't cover constellations in the south hemisphere. How to do it? It is a bit tedious but it can be done and you will learn the constellations pretty well at the end of it. Steps:
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- Open the file `plantearium.data.csv`. There you have the 500 stars that we have in the planetarium. The number of each star is the line number. For isntance for Sirius, the star number will be 1.
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- Find the two stars that you want to join in your constellation (a constellation line). For identifying a star you have to have a look at the name, usually something like `AL UMA` (alpha star of constellation ursa major). Lets say that you want to join stars 155 and 8 (this is constellation canis menor, that only has a line joining two stars).
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- Go to file `planetarium.const.csv` and add two lines for your new constellation. The first one will be the name of the constellation, the second one the pair of stars that you want to join, separated by coma (see the file for examples).
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- Do not forget to add a break line after the last constellation.
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