Although he considered becoming a professional astronomer, the computer science, physics and math requirements at the University of Illinois were daunting, so he got a degree in German studies and became a hobbyist instead. He's spent decades writing an astronomy column for the Duluth News Tribune and authored several books on the subject, including the particularly helpful "Night Sky With the Naked Eye".

“Astronomy is totally open to being interpreted,” explains King. “If you understand a concept well enough, you can usually put it in terms that anybody can understand."

While he technically retired in 2018 — MPR did an entire segment about it — King’s compelling “Astro Bob” column is as active as it’s ever been. He typically files three pieces a week and sometimes writes a fourth or fifth post for his own blog. His webinar series for Voyageurs National Park also went so well during the pandemic that he’s now writing a monthly calendar of astronomical events for the park’s newsletter.

Such is life for a natural-born astronomer based in Minnesota, a state with two emphatic stamps from the International Dark-Sky Association: the newly anointed Voyageurs and the Boundary Waters Canoe Area Wilderness, which was declared the world’s largest dark sky sanctuary in 2020.

In honor of a flurry of recent astral plane activity and the growing interest around amateur photography and natural phenomena like the Northern Lights, we asked King to break down the ins and outs of astronomy for beginners, starting with the simple principle that’s guided his own stargazing over the years.

1. Be curious.

The main thrust of my writing is to get people outside — to really set an hour aside, look at this meteor shower or that eclipse, and go, ‘Wowwww.' 

I’m a real believer in providing a few facts behind it, too. You can admire just about anything on the surface. Like you can enjoy a flower simply because it's pretty. But if you know something about the habits of that flower, and what pollinates it when it comes up, that intimate knowledge really adds to the experience.

2. Dress accordingly.

Depending on the season, you’re probably going to freeze your butt off for an hour or get bit by a mosquito. Those are the two big drawbacks with being an amateur astronomer — the cold and the bugs.

The solution? Dress for the weather and bring bug spray. I promise it’ll be worth it.

3. The darkest skies are not seen during the depths of winter.

The brightest stars in the sky are in the wintertime, but contrary to popular belief, that’s not when the darkest skies of the year are. They’re during the summer and fall because of light pollution. 

Today’s LED technology is very bright; the lights reflect off the ground and back up into the sky. And when the ground is covered in snow, the difference is enormous.

4. Spring and fall are best for spotting the Northern Lights.

It has to do with the sun’s orientation. It’s tilted a little bit on its axis, and the solar poles are tipped more in the direction of the earth. Material coming from those regions has a better chance of hitting us, hooking up with our magnetic field, and producing Northern Lights.

The best times are usually March/April and September/October. I would plan a trip to Voyageurs sometime between the last quarter moon and the first quarter moon, right around the new moon, when there is a crescent in the morning sky right on through the evening.

Make sure that at least part of your trip is planned for dark sky viewing at that time [because] Voyageurs is top-notch. It gives you the impression that the stars are uncountable.

5. Expect the unexpected.

Voyageurs is perfect for watching a meteor shower. Under those dark skies, you’ll see three times more meteors than I would ever see here in Duluth. There are certain showers that are really, really good — very reliable. If you go when the moon is not nearly full, you'll get a great show.

You might have to wait a bit for the show to start, so download an app on your phone that shows you the night sky. I use a free one called Star Chart. While you're waiting, you can hold it up and learn about the constellations, stars, and planets. 

6. Meteor showers are seasonal.

About half a dozen meteor showers a year have specific dates. 

The other thing you should plan for is lunar eclipses, which occur at different times yearly. You can watch them from downtown Minneapolis no problem, but if you’re out in the countryside, you get that extra dimension when the moon is totally eclipsed. The sky is dark, and all the stars come back, and the moon looks kind of three-dimensional. 

7. Don’t forget about conjunctions.

Conjunctions are when you look across the solar system and see, let’s say, Mars in the foreground. And it happens to be in the same line of sight as Jupiter in the background.

From our perspective, it looks like two objects—two bright planets—are right next to each other in the sky, which is really striking.

8. Leave expensive equipment to experts.

Almost all the things I write about can be seen without equipment. If you want one piece of equipment to keep with you whenever you go, make it a pair of binoculars.

I also recommend visiting a site called Sky Maps. Every month, they have a new chart of the night sky — a map you can print out and use the old analog way. The best part of that site is the list of events you can see with the naked eye. Just pin it up on a corkboard, and you'll have your guide right there.

You can also go to the Voyageurs site every month. I personalize it so it's more regional.

9. Stick with a smartphone.

If you use the night photography mode on a newer phone, you can take lovely pictures of the Northern Lights. I’ve seen some really nice images.

The one key thing with a cell phone is to have a tripod or some way to mount the phone so it's still during the exposure. It might be as simple as just rigging something up with Velcro. As long as you can see and compose the picture, then you're good.

They also make inexpensive tripod mounts for cell phones. You can just get one of them and you're ready to shoot, provided you have more of a modern phone. If you do, just go for it. Put it in night mode, make sure it's mounted with one of those brackets, and play.

Older phones allow you to capture moonrises, crescent moons and bright conjunctions. New phones can also capture the Northern Lights, constellation photography, and even the Milky Way if you're in a dark sky place.

10. Buy a mirrorless if you want a “real camera”.

If I was just starting out and wanted to go high end right away — not messing with cell phones — I would get a mirrorless camera because of its electronic viewfinder. That thing shows the sky the way you see with your eyes, so it's very easy to compose a photograph and focus.

And that's the key when you are photographing the night sky; you have to manually focus because cameras can't focus automatically on stars like you do during the daytime. They seek to focus and they miss. Usually, you have to put everything in manual and use the Live View button.

That’s the number one thing you have to learn when it comes to nighttime photography: Everything must be done manually. You've got to focus on a bright star to make sure your pictures are sharp, and then you're set for the whole night and can do anything.

Find out more about seeing the Northern Lights in Minnesota.