Closed paperanniversary closed 4 years ago
Fil
commented
4 years ago This module does not deal with any data, only formulas to transform spherical coordinates into planar coordinates (and vice versa). Any star map you have seen would have provided its own data.
paperanniversary
commented
4 years ago thanks Fil- so all of the date/time/location information that generates the map, is only based on formulas?
Fil
commented
4 years ago Any map is a combination of:
The projection is only concerned with the question of "where on the map do we put this village". It is used to transform information into visual marks, but it does not contain information in itself.
I'm sorry if I didn't understand your question.
paperanniversary
commented
4 years ago sorry I should have been clearer- I'm referring to the "Star" night sky maps, that show projections of the stars, based on time/date/location. How are these generated?
Fil
commented
4 years ago You'd have to ask their author. A popular source is this csv file https://gist.github.com/nitaku/9607405/#file-stars-csv
paperanniversary
commented
4 years ago great, thanks Philippe!
On Fri, Mar 13, 2020 at 11:06 AM Philippe Rivière notifications@github.com wrote:
You'd have to ask their author. A popular source is this csv file https://gist.github.com/nitaku/9607405/#file-stars-csv
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mbostock
commented
4 years ago paperanniversary
commented
4 years ago Thanks Mike. Do you know which one of these catalogs, that the code uses?
On Fri, Mar 13, 2020 at 12:53 PM Mike Bostock notifications@github.com wrote:
See also: https://ssd.jpl.nasa.gov/?ephemerides http://www.stjarnhimlen.se/comp/ppcomp.html
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mbostock
commented
4 years ago If you’re referring to my Star Map, it says:
I believe the data is from the Yale Bright Star Catalog, but I got it from Matteo Abrate’s sky map.
paperanniversary
commented
4 years ago That was incredibly helpful. LOVE your star map, and I really appreciate the info. All the best!
On Fri, Mar 13, 2020 at 1:03 PM Mike Bostock notifications@github.com wrote:
If you’re referring to my Star Map https://observablehq.com/@mbostock/star-map, it says:
I believe the data is from the Yale Bright Star Catalog http://tdc-www.harvard.edu/catalogs/bsc5.html, but I got it from Matteo Abrate’s sky map https://bl.ocks.org/nitaku/9607405.
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Does anyone have info about what the actual source of the projections are? I.E. NASA data, European Space Agency's Hipparcos mission, etc.
I would love to know where the actual star data is coming from.
Cheers!