Monday, February 15, 2010

Yet Another Planetarium Simulation

Last November, as another semester of teaching Elementary Astronomy drew to a close, I finally broke down and started writing my own planetarium simulation.

On its face, this was a ridiculous waste of time. There are already dozens, if not hundreds, of planetarium simulation programs that will show you where the stars and planets appear in the sky, as viewed from your chosen location at your chosen time. They run on every microcomputer platform and many handheld devices. Some are extremely sophisticated, with databases of millions of stars, beautiful images, and even the ability to interface with a telescope.

But I wanted something a little different. To be useful to most of my students, a simulation program has to be (a) free; (b) delivered through a web browser, with nothing to download or install; (c) easy for beginners to understand; and (d) convenient for showing the motions of the stars and other objects with respect to earth's horizon.

Sky View Cafe is a great Java applet that almost fits the bill, and I’ve been recommending it to my students for several years. It’s loaded with features and was obviously written by a pro. But its time/date control is a bit awkward to use, so it isn’t ideal for showing celestial motions. Worse, its default full-sky view can be disorienting for beginners, who often have trouble relating the circle on the screen to the domed sky overhead.

Fifty-six years ago, H. A. Rey showed the best way to draw the sky for beginning observers. The illustrations in his delightful book Find the Constellations show half the visible sky at a time, as if viewed through a huge domed window stretching 180 degrees from side to side, from the horizon at the bottom to zenith at the top. I vividly remember reading that book as a child, and I wanted a web applet that gives a similar view of the sky.

I also wanted intuitive, analog controls for changing the time and date, so the sky’s motions would be easy to explore. Inspired by the GoSkyWatch iPhone app, I settled on a circular dial for changing the time of day, with a concentric inner dial for changing the date of the year. I added similar analog controls for setting the latitude and longitude.

To make the motions even more apparent, I included a feature that WSU’s digital planetarium projector has: the ability to show “trails” that simulate long-exposure or multiple-exposure photographs. Besides the familiar star trails, you can use this feature to trace out analemmas and retrograde loops.

This project has soaked up much of my free time for the last three months, but I think it’s essentially finished for the time being. I hope my students--and others who discover it--will find it useful.

Thursday, February 11, 2010

Skiing Wheeler Creek

Without a doubt, Ogden’s best easy ski touring is on the Wheeler Creek trails, below Snowbasin. While the better skiers are risking their lives on higher, avalanche-prone slopes, I find plenty of challenge--and great exercise--on twisting, narrow trails over gentler terrain.

My favorite tour, when snow conditions allowed, was to ascend the East Fork of Wheeler Creek from the Art Nord trailhead to Green Pond. After an initial 1.5-mile climb, the terrain opens out and you’re suddenly rewarded with an expansive view of Mt. Ogden and its satellite peaks. The photo above was taken from that magical spot on my very first trip up this trail, 15 years go. (That’s Jock up ahead.)

The final leg of the three-mile trail to Green Pond is now crossed by the new Snowbasin highway, which has ruined several of the old routes in the Green Pond area. So now the best option is to stop just short of the highway and descend the lovely trail along the Middle Fork of Wheeler Creek, closing a five-mile loop either on the old highway (now unplowed and groomed for skate skiers) or on the more challenging trail that parallels the highway just to the north. Ten of us went on a Sierra Club outing around this loop last Sunday, enjoying it as much as ever.

Fifteen years ago, navigating any of these trails in winter required good route-finding skills and a high tolerance for oak brush. But the Forest Service rebuilt all the trails shortly before the 2002 Olympics, clearing the brush and building excellent bridges across the many tributary creeks. Now the trails get packed down by snowshoers soon after each storm, so navigation is rarely a challenge.

The East Fork / Middle Fork loop outlines a small peninsula of public land, bordered by private land on the east, west, and south. It’s just a matter of time before those private lands will be developed with trophy homes and golf courses. The solitude and sense of remoteness will then be nearly gone, but at least the trails themselves will remain.