Monday, November 29, 2010
Sunday, November 28, 2010
2sky is a full-featured planetarium application for PalmOS devices. It should work on both the newest PalmOS devices (TX, Centro, Treo) as well as older devices as far back as PalmOS 3.1 and maybe even 2.0. Open 2sky supports standard square screens, as well as the extended non-square screens of just about all devices.
Thanks to Kevin S. Polk's generosity in releasing 2sky to me under the GPL, I am happy to announce that 2sky for PalmOS is now officially released, free of charge. Click on "Download" at:
I think the interface of 2sky is a model of elegance. The features include:
- star catalogs up to magnitude 11 (and smaller catalogs for devices with more limited memory)
- NGC/IC catalog
- Solar System objects including Sun, moon, planets, Pluto, moons of Jupiter, major asteroids, bright comets, and meteor shower radiants
This release of open 2sky is essentially the same as the last paid release of 2sky (3.0.2), except that I've:
- updated US/Canada/Mexico daylight savings rules which had changed in the meanwhile
- refreshed the asteroid and comet databases
- added support for Handera and Dana Alphasmart non-standard screen sizes
- removed the white border around the screen on the TX and some other newer devices
- rewritten code that wasn't GPL-compatible and made the code-base compile with prc-tools rather than Codewarrior
- added Waco and Turner Research Station to the locations :-)
The resulting binaries are actually slightly smaller than the last paid release.
Wednesday, November 24, 2010
Monday, November 22, 2010
Isn't the screenshot beautiful?
Wednesday, November 17, 2010
Friday, November 12, 2010
Thursday, November 11, 2010
The ten Nikos add up to 43mm total, and the three Gemkos I have from an earlier purchase give me 14mm. I could control the length of the fine-tuning tube in increments of about 4.5mm by adding and subtracting one filter housing at a time.
Friday, November 5, 2010
The whole assembly then fits around the focuser tube of the microscope, with the top of the wooden tube being flush with the top of the microscope's focuser tube. Eyepieces then fit in the aluminum collar that sticks out on top. The nice thing about making the adapter fit around the focuser tube instead of the more obvious inside is that it doesn't contribute any vignetting.
Of course, it would have looked a bit neater to make the inner tube of aluminum. But ordering an aluminum tube would cost about $8, while a dowel cost $4, plus I wanted the dowel for another project. Moreover, there is an advantage to using a wood inner tube--it won't scratch the outside of the microscope focuser tube as much as metal would. I suppose PVC could have worked as well, but the closest I could find in PVC was 1.29" OD, and I didn't relish the thought of sanding that down to 1.25" OD to fit inside the aluminum tube.