How to Navigate by the Stars

Thinkstock
Thinkstock

Explorers have used the stars as a compass for millennia, and if you’re out having adventures at night, you should add the skill to your arsenal. (If nothing else, it’s a killer party trick.) Here’s how to transform the night sky into your personal roadmap.

1) Learn the Big Three

According to the Royal Naval Academy, 58 stars are handy for navigation. You need to know 38 different constellations to find all of them. If that seems daunting, there’s a cheat code. Just learn to spot three constellations: Cassiopeia, Crux, and Orion. Also keep your eye on the Big and Little Dipper.

2) Find the North Star

It’s always within one degree of true north. So use the Big Dipper and Cassiopeia are your guides. Look at the Dipper’s ladle and pretend you’re pouring soup from it. The flow of that space soup will point straight to the North Star. If you hit a constellation that looks like a wonky ‘W,’ you’ve gone too far. That’s Cassiopeia. Recalculate your cosmic GPS and back up. The North Star is smack between Cassiopeia and the Big Dipper.

3) Shoot for the Moon

If you can find Orion’s sword, following its point will show you south. Alternatively, if there’s a crescent moon, draw an imaginary line from between its tips and follow it to the horizon. That’ll point your toward the penguins.

4) Down Under? No Problem!

The North Star isn’t visible below the equator. Instead, look for the constellation Crux—it resembles a kite. If you draw a line from the top of the kite to the bottom, it’ll point you south.

5) Move Like a Star

Like the sun, stars skate east to west. Tracking how they travel across the sky should tell you which way you’re facing. For something more precise, look to Orion’s belt. The star on the belt’s right side—Mintaka—rises close to true east and sets at true west.

6) Take a Survey

Forgot to memorize your constellations? There’s an easy fix. Simply place two sticks in the ground and set them one yard apart. Now pick a star—any star. Line it up with the tops of both sticks, as if you were looking down a rifle sight. The earth’s rotation will make the star “move.” If it runs left, you’re facing north. If it shifts right, you’re south. If it rises, you’re east. If it sinks, west.

Amazon's Best Cyber Monday Deals on Tablets, Wireless Headphones, Kitchen Appliances, and More

Amazon
Amazon

This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links.

Cyber Monday has arrived, and with it comes some amazing deals. This sale is the one to watch if you are looking to get low prices on the latest Echo Dot, Fire Tablet, video games, Instant Pots, or 4K TVs. Even if you already took advantage of sales during Black Friday or Small Business Saturday, Cyber Monday still has plenty to offer, especially on Amazon. We've compiled some the best deals out there on tech, computers, and kitchen appliances so you don't have to waste your time browsing.

Computers and tablets

Amazon

- Amazon Fire HD 10 Tablet 64GB; $120 (save $70)

- Amazon Fire HD 8 Tablet 64GB; $84 (save $35)

- HP Pavilion x360 14 Convertible 2-in-1 Laptop; $646 (save $114)

- HP Pavilion Desktop, 10th Gen Intel Core i3-10100 Processor; $469 (save $81)

- Acer Nitro 5 Gaming Laptop; $973 (save $177)

Headphones and speakers

Beats/Amazon

- Bose QuietComfort 35 II Wireless Bluetooth Headphones; $200 (save $100)

- Sony Bluetooth Noise-Canceling Wireless Headphones; $278 (save $72)

- JBL LIVE Wireless Headphones; $100 (save $30)

- JBL Charge 4 - Waterproof Portable Bluetooth Speaker; $120 (save $10)

- Bose SoundLink Color Bluetooth Speaker II; $79 (save $50)

- Powerbeats Pro Wireless Earphones; $200 (save $50)

Video Games

Sony

- Watch Dogs Legion; $30 (save $30)

- Marvel's Avengers; $27 (save $33)

- Ghost of Tsushima; $40 (save $20)

- The Last of Us Part II; $30 (save $30)

TECH, GADGETS, AND TVS

Samsung/Amazon

- Amazon Fire TV Stick; $30 (save $20)

- Echo Show 8; $65 (save $65)

- Nixplay Digital Picture Frame; $115 (save $65)

- eufy Smart Doorbell; $90 (save $30)

- Samsung 75-Inch Class Crystal 4K Smart TV; $898 (save $300)

home and Kitchen

Ninja/Amazon

- T-fal 17-Piece Cookware Set; $124 (save $56)

- Le Creuset Enameled Cast Iron Curved Round Chef's Oven; $180 (save $136)

- Ninja Foodi 10-in-1 Convection Toaster Oven; $195 (save $105)

- Roborock E4 Robot Vacuum Cleaner; $189 (save $111)

- Instant Pot Max Pressure Cooker 9 in 1; $80 (save $120)

- Shark IZ362H Cordless Anti-Allergen Lightweight Stick Vacuum; $170 (save $110)

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How Much Is the Earth Worth?

The New York Public Library, Unsplash
The New York Public Library, Unsplash

Our home planet may be the most precious place we know, but it isn't priceless. The Earth's resources and the value it offers to humans add up to some unknown, tangible cost. The species may never have to worry about buying or selling the world, but thinking of it in terms of concrete numbers can help us better understand its value. Now, as Treehugger reports, one scientist has developed a special formula that allows us to do just that.

According to the calculations of Greg Laughlin, an assistant astronomy and astrophysics professor from the University of California, Santa Cruz, the Earth is worth roughly $5 quadrillion (or $5,000,000,000,000,000). He came up with that price after gauging the planet's mass, temperature, age, and other factors that directly correlate to its ability to sustain life.

To emphasize just how valuable the Earth is, Laughlin also estimated the worth of other planets in our solar system. Our nearest neighbor Mars costs about the same as a used car at $16,000. That's a fortune compared to Venus, which he appraised at the meager value of one cent.

Laughlin doesn't expect these numbers to have applications in the real world. Rather, he hopes they will inspire people to better appreciate the only home they know. He's not the first person to put a massive, hypothetical price tag on something just for fun. The cost of the Death Star from Star Wars has been calculated at $852 quadrillion—many times Laughlin's estimate for Earth.

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