Tuesday, May 8, 2012

The Gateway

I can't believe that it took me nearly a year to do more than just drive across the Golden Gate Bridge...

Last summer, I walked across it instead!

Some of you might've heard of the Golden Gate Bridge before. For most of us, it's only recognizable because of Full House:

[caption id="attachment_1136" align="aligncenter" width="983" caption="Whatever happened to predictability..."][/caption]

Wait a second, that's not the right picture... Alamo Square and the Painted Ladies are not the Golden Gate Bridge. Why I'm so certain: do you see any water in that picture?

Sidenote: I dare you to not have the Full House theme stuck in your head right now.  Mwahahahahaha.

Yeah, let's try this again...

Nope. Nope nope nope. I can sorta get it, this is the Japanese Tea Gardens. As you can see, there's a gate, so we got one word right this time. And it's in Golden Gate Park, so that's sorta close. Otherwise, again, it's the completely wrong picture.

Maybe the 3rd time's the charm?

Wow. We went from being slightly related to the bridge to not at all. That can't be good.

So, this is the Palace of Fine Arts. It's a nice little park/place to get wedding pictures (seriously, everyone does).

At least we're moving in the right direction though: North.

[caption id="attachment_1137" align="aligncenter" width="983" caption="That's more like it!"][/caption]

There we go! That definitely looks more bridge-like! And yes, the picture does no justice to its great and mighty orange-ness.

In case you're wondering, the name "Golden Gate" refers to the entrance to San Francisco Bay itself. That's why there's so much named after it: the bridge, the park, the university, the cemetary, and even the casino.

[caption id="attachment_1142" align="alignleft" width="179" caption="Me, happy(ish)"]With hat, and happy-ish[/caption]

Anyway, it was a good walk. Chilly, windy, and deafening, but good. The bridge is just over one and a half miles in span, so it's a decent walk to get down to one end and back. Also, you don't realize just how giant it is until you're crossing it. Sure there's the Bay Bridge too, and it's longer and has more traffic. But there's something just majestic and awesome about the Golden Gate Bridge. It has the kind of style the Bay Bridge will never have.

Did I say earlier it was windy? That's an understatement. Everyone's seen those old movies where it's so windy the guy is walking backwards right? If you want to experience that, cross the Golden Gate Bridge on foot. It's definitely a fun experience, and I was enjoying myself. It was as if nothing could go wrong.

Or at least, that's just what they wanted me to think!

[caption id="attachment_1139" align="alignright" width="225" caption="Me, sad..."]My Hat![/caption]

We were nearing the north end of the bridge. Before I knew it, blam came a gust and knocked my hat away! Straight over the side! To be lost forever!

That hat had been a close and dear friend. I'd had it since I was a freshman at Georgia Tech. It was my band cap, coming with me for every football game, helping cheer on the Yellow Jackets. There were so many things that cap accompanied me through, whether my yearly Get-A-Clue excursions or even my last trip to Greece. It was with me through good times and bad, and it was always there when I needed it!

But no! That bridge (a.k.a. evil incarnate) decided to take from me something I held dear! How dare it?!

Well, I guess I got sidetracked. This was supposed to be about the bridge, and how it's really pretty dang cool. It's definitely a marvel, and walking along it gets you to think how much has gone into it. To think it's 75 years old makes it even more amazing. I'd definitely suggest taking the time to visit it yourself if you make it out to the Bay Area.

But just remember, it's a harsh mistress. If you decide to take the journey, make sure everything you wear is tied down. Who knows what the bridge will decide to take next? A baby? I wouldn't put it past that orange devil!


While I miss my hat, I was able to procure a new band cap last fall. Right now it's just a replacement, but maybe, given time, we can build a solid rapport and it will graduate into being my dear friend like its predecessor. I'm sure we'll have many adventures together, I just have to hold onto this one. I'll tell you now though, the one place it will never be allowed to go is across any bridge, especially giant orange ones.

Also, I guess it's now been another year since I moved out here. Maybe I should finally make my way to Muir Woods...

Saturday, May 5, 2012

Look! Up in the Sky! It's Supermoon!

Perigee SyzygyYou might want to take a look outside tonight. The Moon will be strutting its stuff as today it's no moon, it's a Supermoon! Obviously something called a "supermoon" must be supernatural in some form or another. I mean it's lining up with the peak of an annual meteor shower (Eta Aquariids) and Cinco de Mayo. Coincidences like this simply don't happen!  Other than today of course, when they do.

If you want to know what it means for your horoscopes, I'd suggest going to speak with a licensed astrologer. You might also need to stock up on some homeopathic medicines while you're at it, as you never know where the day will take you.

Ok, back to the point at hand. So "supermoon" is actually a colloquial term and is not accepted astronomer jargon. Astronomers would tell you tonight is the perigee-syzygy of the Moon in the Earth-Sun-Moon system. Yeah, that's not very helpful is it? I'll explain.

The Moon orbits the Earth in an elliptical orbit. On an ellipse, the perigee and apogee are the closest and farthest points from the center respectively. So the first part of a supermoon is that the Moon is at its closest point to Earth in its orbit. For the Moon specifically, the orbit is around 405,000km away at its apogee and around 360,000 km away at its perigee. It's basically 50,000 km closer at perigee than at apogee! The orbital period of the Moon, the time it takes to make one full revolution from perigee back to perigee, is called the anomalistic month and averages out to around 27.5 days.

Now syzygy should be a more familiar term, however we tend to use other names for it. To clear things up, no, I do not mean that episode of The X-Files where the two high school girls go crazy with mind powers and kill Ryan Reynolds. Syzygy is the term for when the positions of three astronomical bodies make a straight line. A true syzygy with the Earth, Moon, and Sun would be in times of solar and lunar eclipses, as either the Earth is directly between the Sun and Moon or the Moon is directly between the Sun and Earth. The term is also used more generically however to denote new moons and full moons. These aren't times when the three bodies are aligned, but they do represent a specific alignment of the Sun and Moon in relationship to the Earth. A lunation, or synodic month, is the time it takes the Moon to complete one lunar phase cycle; it averages around 29.5 days.

So really a perigee-syzygy in this sense could mean we're experiencing a new moon or a full moon while the Moon is at its perigee. Of course, why would we care about a new moon, we can't see it! So "supermoon" is really just a full moon at its closest point in orbit. Due to it being closer, it will actually be noticeably larger than average (the reported number is 12%). If the Moon were at it's apogee instead, it'd only be three-quarters as large and bright as you can see it today (it turns out 50,000 km can make quite a difference).

[caption id="attachment_1117" align="aligncenter" width="600" caption="The periods of the anachromal and syndochal months are above, with the lower graph representing the period of their interference."]Beats Between Months[/caption]

Now, as I mentioned, the Moon completes a revolution in about 27.5 days, but the lunar phase cycle takes 29.5 days. This causes a beat period between the two as they go in and out of phase together (shown above). This entire cycle is called the full moon cycle and occurs once about every 14 lunations (just under 14 months).  In fact, the last supermoon was in March 2011. So don't worry too much if you miss this one, the next one should be around July 2013. And if you miss the Eta Aquariids, they'll be back next year the same time as always.

The point of the story? It's just a big moon, spiraling around us at a kilometer a second, as we go spiraling around the Sun at 30 kilometers a second. Same as always, no big deal. But go out and enjoy it, because it'll be cool. If you're lucky, you'll see some shooting stars as well. And if you're really lucky, you won't party too hard for Cinco de Mayo and actually be able to remember your evening under the supermoon.