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Solar Eclipse Across America - August 21, 2017

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Looking directly at the Sun is unsafe except during the brief total phase of a solar eclipse ("totality"), when the Moon entirely blocks the Sun's bright face, which will happen only within the narrow path of totality. To find out whether your home or any other specific location is within the path on August 21, 2017, see Xavier Jubier's Google Map, which supports zooming in to street level.

The only safe way to look directly at the uneclipsed or partially eclipsed Sun is through special-purpose solar filters, such as "eclipse glasses" (example shown at left) or handheld solar viewers. Homemade filters or ordinary sunglasses, even very dark ones, are not safe for looking at the Sun; they transmit thousands of times too much sunlight. See our Reputable Vendors of Solar Filters & Viewers page for a list of manufacturers and authorized dealers of eclipse glasses and handheld solar viewers verified to be compliant with the ISO 12312-2 international safety standard for such products.

Instructions for safe use of solar filters/viewers:

Always inspect your solar filter before use; if scratched, punctured, torn, or otherwise damaged, discard it. Read and follow any instructions printed on or packaged with the filter.

Always supervise children using solar filters.

If you normally wear eyeglasses, keep them on. Put your eclipse glasses on over them, or hold your handheld viewer in front of them.

Stand still and cover your eyes with your eclipse glasses or solar viewer before looking up at the bright Sun. After looking at the Sun, turn away and remove your filter - do not remove it while looking at the Sun.

Do not look at the uneclipsed or partially eclipsed Sun through an unfiltered camera, telescope, binoculars, or other optical device.

Similarly, do not look at the Sun through a camera, telescope, binoculars, or any other optical device while using your eclipse glasses or handheld solar viewer - the concentrated solar rays could damage the filter and enter your eye(s), causing serious injury.

Seek expert advice from an astronomer before using a solar filter with a camera, telescope, binoculars, or any other optical device; note that solar filters must be attached to the front of any telescope, binoculars, camera lens, or other optics.

If you are inside the path of totality, remove your solar filter only when the Moon completely covers the Sun's bright face and it suddenly gets quite dark. Experience totality, then, as soon as the bright Sun begins to reappear, replace your solar viewer to look at the remaining partial phases.

Outside the path of totality, you must always use a safe solar filter to view the Sun directly.

Note: If your eclipse glasses or viewers are compliant with the ISO 12312-2 safety standard, you may look at the uneclipsed or partially eclipsed Sun through them for as long as you wish. Furthermore, if the filters aren't scratched, punctured, or torn, you may reuse them indefinitely. Some glasses/viewers are printed with warnings stating that you shouldn't look through them for more than 3 minutes at a time and that you should discard them if they are more than 3 years old. Such warnings are outdated and do not apply to eclipse viewers compliant with the ISO 12312-2 standard adopted in 2015. To make sure you get (or got) your eclipse glasses/viewers from a supplier of ISO-compliant products, see our Reputable Vendors of Solar Filters & Viewers page.

An alternative method for safe viewing of the partially eclipsed Sun is indirectly via pinhole projection. For example, cross the outstretched, slightly open fingers of one hand over the outstretched, slightly open fingers of the other, creating a waffle pattern. With your back to the Sun, look at your hands' shadow on the ground. The little spaces between your fingers will project a grid of small images on the ground, showing the Sun as a crescent during the partial phases of the eclipse. Or just look at the shadow of a leafy tree during the partial eclipse; you'll see the ground dappled with crescent Suns projected by the tiny spaces between the leaves.

A solar eclipse is one of nature's grandest spectacles. By following these simple rules, you can safely enjoy the view and be rewarded with memories to last a lifetime.
This safety information has been endorsed by the American Astronomical Society, the American Academy of Ophthalmology, the National Aeronautics and Space Administration, the American Academy of Optometry, the American Optometric Association, and the National Science Foundation. Note: This document does not constitute medical advice. Readers with medical questions should contact a qualified eye-care professional.
The information on this page is also available as a printable flyer - in both English and Spanish! If you're selling or giving away "eclipse glasses" or handheld solar viewers at an eclipse-watching event, we encourage you to hand out copies of the flyer along with the manufacturer's instructions. Feel free to distribute copies of the flyer to family, friends, colleagues, or anyone else who asks you about the August 21, 2017, solar eclipse. We also have a 2-page graphics-only version that works in any language!

More eclipse safety tips from the AAS & NASA:

Eclipse safety tips from the American Academy of Ophthalmology:

Eclipse safety tips from the American Optometric Association:

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Looking directly at the Sun is unsafe except during the brief total phase of a solar eclipse ("totality"), when the Moon entirely blocks the Sun's bright face, which will happen only within the narrow path of totality.

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Explore Arduino's community hub to learn and share about their products! Join 116121 hardware developers who follow Arduino on Hackster.io.

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Raspberry Pi Projects: Raspberry Pi is a dynamic microcontroller that is capable of just about anything a computer is. It runs with the Python programming language, and is a great way to learn about hardware hacking and coding. Check out these awesome Instructables to ins...

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Lifehacker's Complete Guide to Raspberry Pi Lifehacker's Complete Guide to Raspberry Pi Everyone wants a tiny little computer that can do it all, but how do you get started? Use this guide to master your brand-new Raspberry Pi.

Maybe you picked up a Raspberry Pi for the holidays, or you've been sitting on one of the super versatile, palm-sized computers for a while now. If you've been wondering how to get started with yours, or what you could build that's worthwhile, here are ten great ideas.

10. A Weather Station

Sure, sure, you could always just look out the window to see what the weather is like, but where's the fun in that when you could have precise temperature, atmospheric pressure, wind speed, and a forecast along with all of that? Look no further than your Raspberry Pi, and a few extra components.

Of course, if you want something a little more flexible, or a little more fun, consider building this color-changing lamp that will reveal the weather forecast based on the color and light pattern with your Pi, or this slightly simpler version that looks pretty good on a bookshelf if I do say so myself.

9. A Photo Booth

What's more fun than taking lots of great photos with your friends when you're all hanging out having a great time? Turn the Pi you've had sitting around for ages into a photo booth designed specifically to capture those awesome moments, and then share them with your friends.

You have choices too - the one above has a touchscreen and a little countdown timer, but if you don't want to go through that much energy, try this simpler version (you don't need the custom box, obviously) that auto-uploads the photos in animated GIF form to a Tumblr account you create for the event-or for your project.

8. A Home Surveillance System

The beauty of the Raspberry Pi is that it's a pocket-sized computer. That means it can go virtually anywhere, like in the garage, near the front door, or anywhere else you need a pair of eyes and have a power outlet. This beginner project will turn your Pi into a home security system in no time.

When you're ready to shoot for the moon, you could build a multiple-camera system with a Raspberry Pi, if you want eyes all over the house or yard. This project uses Windows IoT to do the same thing with your Pi if you're looking for an alternative that might look a little more familiar.

7. A DIY Arcade Stick

By far one of the most popular Pi projects is an arcade machine, and we'll get to that. We're putting the cart before the horse a little bit and suggesting that you put your retro game console inside an arcade stick, so you can play your favorite old school games on the perfect controller for those games all at once.

The one above uses a classic arcade design, complete with beautiful acrylic, but if you want something a little easier for beginners-complete with a step-by-step instruction video that shows you how to make both the housing and the console itself, this one is perfect for you.

6. A Completely Portable, Digital eBook Library

If ebooks are your thing, and carrying around tons of them-or even sharing them with others-is your jam, this mobile digital library is ideal for keeping, sharing, and trading books with your friends. Best of all, it's completely powered by a Raspberry Pi. It's portable, and turns your Pi into a Wi-Fi hotspot that others can connect to, find something to read, and grab it to take with them. Isn't sharing wonderful?

5. A Go-Anywhere, Wearable Camera

Maybe you want to chronicle your life, or do one of those "day in the life" experimental videos where someone can walk a mile in your shoes. Maybe you're just planning an awesome hike or bike ride and want to take a video of the whole trip. Well, if you have a Pi, you have a perfect project to capture all the fun. This wearable camera is powered by a Pi and a battery, and is small enough to tuck on a shirt or around your neck on a lanyard.

If you want to take it an extra mile, you could build this internet-connected model that live streams to YouTube in real time, but you might want to keep this one somewhere your Pi has either signal or Wi-Fi.

4. A Whole-Network Ad Blocker, or a Call-Home VPN

If you're a little more tech-inclined, consider this whole-network ad blocker that'll protect all the devices and systems on your network from ads, malvertising, and other annoying hover-over and pop-over ads, even on your mobile devices. It's a little work, but it's worth it.

3. A Streaming Internet Radio

2. A DIY Amazon Echo

Of course, you don't need to go through all of that just to make one yourself. We have you covered in this complete, start to finish guide here -and once you do have one built, you can use it for everything you would normally use an Echo for, from trivia to web searches and more.

1. A Retro Gaming Console

We've teased at it, and covered in the past, but by far our preferred suggestion for beginners is to build your own Raspberry Pi-powered retro game console and play the hell out of your favorite old school titles.

Of course, the shape and style of your console is up to you, so you can get a fancy 3D printed case and make yours look like an old school Nintendo, turn yours into a two-player arcade table with a little IKEA hacking, build a whole cabinet, or pack yours into a game cartridge, or even a busted controller.

When you get started though, you won't be able to stop, so check out our advanced guide to your Pi-powered console when you're ready, and check out our rundowns of the best retro console software to play all of those games.
Lifehacker's Weekend Roundup gathers our best guides, explainers, and other posts on a certain subject so you can tackle big projects with ease. For more, check out our

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Top 10 Raspberry Pi Projects for Beginners

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Maybe you picked up a Raspberry Pi for the holidays, or you've been sitting on one of the super versatile, palm-sized computers for a while now. If you've been wondering how to get started with yours, or what you could build that's worthwhile, here are ten great ideas.

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The Raspberry Pi is a low cost, credit-card sized computer that plugs into a computer monitor or TV, and uses a standard keyboard and mouse.

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Build a modern computer from first principles

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Build a modern computer from first principles

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The Elements of Computing Systems / Nisan & Schocken

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Building a Modern Computer From First Principles

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Projects Archive | Make: DIY Projects and Ideas for Makers

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Make: is the voice of the Maker Movement, empowering, inspiring, and connecting Makers worldwide to tinker and hack. Subscribe to Make Magazine Today!

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Building a computer from scratch gives you the perfect machine for your needs, but it can be daunting the first time around. Here's our complete guide, from picking the parts, to putting it together and installing your OS.

This Night School series was originally published in 2011. We've gone through and given it some much-needed updates: we changed outdated references, added some new resources and tools, and expanded a few sections. Enjoy!

For our first lesson in building your own PC, we start with a little computer hardware basics.

In this lesson, we'll show you how to most effectively pick out and shop for your parts.

Assembling your computer can seem daunting, but it's actually pretty easy. In lesson 3, we show you step-by-step how to put everything together.

Once you've put it together, you're past the difficult portion. Lesson 4 deals with installing your operating system and get everything up and running.

There's a lot more computer-building info out there than we can fit into one Night School. In our final lesson, we share some other resources that should help you in both the building and post-building steps.

If you'd like all of these lessons in a printable format, I recommend sending each article to a service like Readability or Pocket. That way, you can print out a clean, readable version that you can reference as you build. Thanks for learning with us this week!

Check out the full Lifehacker Night School series for more beginners lessons covering all sorts of topics.

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How to Build a Computer: The Complete Guide

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Building a computer from scratch gives you the perfect machine for your needs, but it can be daunting the first time around. Here's our complete guide, from picking the parts, to putting it together and installing your OS. This Night School series was originally published in 2011.

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Step-by-step

We make it easy to learn how to make anything, one step at a time. From the stovetop to the workshop, you are sure to be inspired by the awesome projects that are shared everyday.

Made By You

Instructables are created by you. No matter who you are, we all have secret skills to share. Come join our community of curious makers, innovators, teachers, and life long learners who love to share what they make.

A Happy Place

Making things makes people happy. We can't prove it, but we know it to be true. Find your happy place, and join one of the friendliest online communities anywhere.

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Instructables is a community for people who like to make things. Come explore, share, and make your next project with us!

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Breathe easy - we finally have an I2C VOC/eCO2 sensor in the Adafruit shop! Add air quality monitoring to your project and with an Adafruit CCS811 Air Quality Sensor Breakout. This sensor from AMS is a gas sensor that can detect a wide range of Volatile Organic Compounds (VOCs) and is intended for indoor air quality monitoring.