astronomy – Page 3

Lunar Globe

Posted on October 24, 2023October 24, 2023 by Brian Garthwaite

From the days before planetarium software was readily available, we have an intense glut of celestial globes, which show the positions of the stars and constellations on the night sky. Also the day sky, of course, but unless you’re watching a total solar eclipse they get lost in the bright blue light scattered by our atmosphere. They get little use except as office decorations.

We have two Earth globes – one is a giant, inflatable beach ball – which still get regular use in Astronomy classes. Unsurprisingly, visualizing the movement of an Earthbound observer on a tilted, rotating, orbiting planet around the sun isn’t always intuitive. Having a mini-Earth to look at helps immensely.

We also have a very nice lunar globe, which really should see more use. It’s highly detailed, including on the side of the moon that only a handful of humans have ever seen. (More craters, fewer mare.) If you dig maps, it’s a very cool map.

Lunar globe base label — *Scale 1 : 8,533,150.*

And when did this charming item come into being? 1969, of course.

Quality

Posted on September 20, 2023September 20, 2023 by Brian Garthwaite

One-bar metallophone — *You can’t tell from the photo, but the tone is lovely.*

Both Physics and Astronomy courses do a lot of work with waves, and while light is one of the most important types for study, sound is exceptionally handy for demonstrations. There’s an immediacy, a feel, that can make sonic demos feel more intuitive.

We have a few of these about, metal bars with supports at the nodes of a standing wave, seated over a wooden box. The string goes where the bar doesn’t vibrate, and hence doesn’t dampen the sound, while the box helps it resonate louder. Ka-bong! They’re quite fun.

And, yes, Carl J. Ulrich of Minneapolis, Minnesota did some fine work here.

Astronomy Club Minutes

Posted on September 1, 2023September 1, 2023 by Brian Garthwaite

In the early ’90s, we had an Astronomy Club. Reading through old club meeting minutes sometimes turns up little gems, like these:

“Sorry for the late minutes. The secretary had a lot of tests at the end of last week.”

Completely understand. Full respect for those priorities.

“Because of clear skies, the meeting did not last long.”

We’re here for the telescopes, not chit-chat! Again: completely understand!

Mathematics & Astronomy

Posted on August 21, 2023 by Brian Garthwaite

Once upon a time – for a good long while, in fact – mathematics and astronomy overlapped. Now, of course, astronomy is considered more appropriately physics-adjacent, and mathematics would like to make it clear that while they share a department with statistics, the two really are their own, distinct fields.

Then there’s the fuzzy boundary zone between biophysics and applied mathematics and mechanical engineering…

Welcome to the new semester!

Water Tower Light

Posted on August 11, 2023 by Brian Garthwaite

In our attempts to minimize the ever-growing aura of light pollution around the Observatory, we work to form good relationships with our neighbors. And to maintain them.

Back in 1979 – an excellent vintage! – the Keystone Water Company agreed to a switch controlling the light outside their standpipes, just south of the Observatory. For as long as we remain good stewards of the switch, always turning it back on when we’re done observing, they let us adjust the night sky’s brightness just a little bit more each night.

Forty-four years and counting.

Passive Aggression

Posted on August 7, 2023 by Brian Garthwaite

Your average TA for an Astronomy night lab is excited about their job. They not only took an Astronomy course, but liked it enough to come back. At night. Irregularly, as the weather permits, sometimes in the cold of a Pennsylvania winter. They’re enthusiastic about their job. We’re enthusiastic about them.

So when you find notes from almost three decades ago with student gripes? Totally understand. We wish every student could bring the same excitement to a night with telescopes and stars.

And, for the record: Saturn absolutely is beautiful through a telescope on a night with no moon. Just phenomenal.

Solar Eclipse

Posted on July 3, 2023 by Brian Garthwaite

As we prepare for the next major solar eclipse in North America – mark your calendars for the 8th of April, 2024! – it’s fun to look back at Observatory records from previous eclipses. On May 10th, 1994, nearly 300 people congregated at the Observatory to take in the spectacle of a partial eclipse.

It’s worth noting that getting the full experience of totality requires a perfect combination of timing, location, and decent weather. Not simple.

This particular event was an annular eclipse, in which the moon’s apparent diameter was less than that of the sun, so that there was always a portion of the sun’s disc visible, creating an annulus (ring) when viewed along the path of greatest eclipse. Still amazing.

Invoice

Posted on May 30, 2023 by Brian Garthwaite

*Always keep your receipts for tax records.*

In 1963, one could purchase a Standard Astro-Dome with a 17′ inside diameter for the low, low price of $14,667. It must have been a worthwhile investment, because we’re still using it 60+ years later with no plans to update or replace it anytime soon.

Adjusted cost in 2023 dollars: $144,932.41.

Fuzzy Mittens

Posted on May 12, 2023 by Brian Garthwaite

Mittens in a filing cabinet. — *One size fits all.*

For those nights at the Observatory when the temperature drops and it gets fiercely cold, we have a little extra insulation from the weather. You might not be able to do much with these on, but you can’t do much when your fingers cramp up, either.

Suitably sized for holding a coffee or hot chocolate while appreciating how a clear, dry night can really bring out the stars.

Old Books

Posted on May 9, 2023 by Brian Garthwaite

It’s not uncommon for any place to collect things and never quite discard them, and it only grows worse when there’s no single person in charge of them. On some old shelves at the Observatory, we have no shortage of 19^th-century astronomical observations from all around the world. A few select favorites recently spotted: Havana, Cuba; Hyderabad, India; Tachkent (now Tashkent), Uzbekistan.

Oldest so far spotted: Washington Astronomical Observations, 1848.

Part of the library collection since 1856. Wonder if the library knows? (We’ve put in a call to the proper folks, so no worries.)

“Library of University Lewisb^g. Dec. 1856″

Neat!

Tag: astronomy