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 Post subject: Re: 3D Stars in 2D Hexes
PostPosted: Tue Feb 20, 2018 2:17 am 
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Matt Wilson wrote:
LiNeNoiSe wrote:

ISTR from my experiments 20-some years ago that it was more like 90° counter-clockwise. Does anyone else have experience with this?


It looks like everything on the Traveller map is 90° clockwise from where it (roughly) ought to be. 61 Cygni (Nusku) should be spinward, for example.


Thanks. I thought it was more than 45°, but I'm such a Space Cadet that I wanted somebody to check my math :D

I found the thread about it over on CotI if anybody's interested.

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PostPosted: Tue Feb 20, 2018 6:03 pm 
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The Near Space map from Stellagama Publishing (PWYW on DriveThruRPG) corrects that issue for those stars near Earth. Coreward really is Coreward and Spinward really is Spinward...

We used the Right Ascension value as the "flattener" and kept the distance from Earth the same. Beyond about 10 parsecs though, the distances have enough error that you could easily move it a hex in or out as desired.

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PostPosted: Mon Feb 26, 2018 8:48 pm 
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Cyborg IM1 wrote:
We used the Right Ascension value as the "flattener" and kept the distance from Earth the same. Beyond about 10 parsecs though, the distances have enough error that you could easily move it a hex in or out as desired.


Because I have no life, I spent the entire weekend converting your stars into 2D galactic coordinates and entering them into Galactic 2.4c. I have to admit that your map is confusing. Your directions (spinward, etc) are meaningless unless you're using galactic coordinates. You don't seem to be using them, at least not consistenly. You don't seem to be using equatorial coordinates, either. Would you please explain exactly what it is that you have done? Your map isn't making any sense. Thanks.

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 Post subject: Re: 3D Stars in 2D Hexes
PostPosted: Mon Feb 26, 2018 9:15 pm 
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Matt Wilson wrote:
It looks like everything on the Traveller map is 90° clockwise from where it (roughly) ought to be. 61 Cygni (Nusku) should be spinward, for example.


I see what you mean. I just spent way too much time on this over the weekend. I've got it mapped to hex 1426, although it could arguably go in 1427. I put Σ 2398 there. Miller's got it at hex 1822 in AM 6. Only a difference of 6-7 parsecs :D

I don't believe Harshman mentoned the star name in Sup 10.

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PostPosted: Tue Feb 27, 2018 5:10 pm 
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LiNeNoiSe wrote:
Cyborg IM1 wrote:
We used the Right Ascension value as the "flattener" and kept the distance from Earth the same. Beyond about 10 parsecs though, the distances have enough error that you could easily move it a hex in or out as desired.


Because I have no life, I spent the entire weekend converting your stars into 2D galactic coordinates and entering them into Galactic 2.4c. I have to admit that your map is confusing. Your directions (spinward, etc) are meaningless unless you're using galactic coordinates. You don't seem to be using them, at least not consistenly. You don't seem to be using equatorial coordinates, either. Would you please explain exactly what it is that you have done? Your map isn't making any sense. Thanks.


Perhaps we simplied it too much.

We used the Right Ascension value of each star, AD2000 data. We then adjusted simply for galactic center as follows:

RA = 0-hours (TRAILING)
RA = 6-hours (RIMWARD)
RA = 12-hours (SPINWARD)
RA = 18-hours (COREWARD)

We did NOT do any more serious adjustments. I know that throws some things off, but since the flattening of the 3-D map into 2-D does so much of that already, we felt our simplification was OK.

Hope that helps!

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PostPosted: Tue Feb 27, 2018 5:28 pm 
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Cyborg IM1 wrote:
Perhaps we simplied it too much.


While I am a simpleton, it's not helping me too much :)

Quote:
We used the Right Ascension value of each star, AD2000 data. We then adjusted simply for galactic center as follows:

RA = 0-hours (TRAILING)
RA = 6-hours (RIMWARD)
RA = 12-hours (SPINWARD)
RA = 18-hours (COREWARD)

We did NOT do any more serious adjustments. I know that throws some things off, but since the flattening of the 3-D map into 2-D does so much of that already, we felt our simplification was OK.

Hope that helps!


Let's take an example. How about Barnard's Star? Coincidentally (?), you've got it exactly where I put it with galactic coordinates.

It's at 17h 57m 48s +4° 41' 36"

What do you do wth the 17 hours and how does that relate to the hex positon?


Ok, maybe I'm seeing it now. Barnyard is close to 18 hours, so it's Coreward. Proxims st 14 29 43 is close to 12, so it's Spinward?

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PostPosted: Wed Feb 28, 2018 5:32 pm 
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I'd hate to think that I wasted my weekend for nothing. Maybe I can file attach the maps. Somebody might find a use for them.


Attachments:
File comment: Esperance Subsector F
FOXTROT.jpg
FOXTROT.jpg [ 15.97 KiB | Viewed 67 times ]

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PostPosted: Wed Feb 28, 2018 5:40 pm 
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I moved Earth back to Hex 1827 from Hex 0911. Using the subsector names from Supplement 10

(Vega actually maps to Dingir Subsector J Hex 1024)


Attachments:
File comment: Vega [sic] Subsector G
GOLF.jpg
GOLF.jpg [ 14.25 KiB | Viewed 67 times ]

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Last edited by LiNeNoiSe on Wed Feb 28, 2018 7:53 pm, edited 2 times in total.
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PostPosted: Wed Feb 28, 2018 5:46 pm 
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Looks like it's forcing me to say something if I want to attach a file.


Attachments:
File comment: Banasdan Subsector H
HOTEL.jpg
HOTEL.jpg [ 14.67 KiB | Viewed 67 times ]

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PostPosted: Wed Feb 28, 2018 5:49 pm 
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I suppose I could quote myself over and over.


Attachments:
File comment: Albadawi Subsector I
INDIA.jpg
INDIA.jpg [ 14.4 KiB | Viewed 67 times ]

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