For this reason, NASA is launching a suite of streaming programs covering the best views of the eclipse and its path of totality, giving anyone a chance to watch on their iPhone, iPad, iPod touch, or Apple TV, particularly those who live far away from the path of totality. NASA Television's "Eclipse Across America" will include vantage points of the eclipse on the ground, from aircrafts, and even from the International Space Station.
To tune into the live broadcast, there are a few platforms you can choose from: the main NASA app for iOS [Direct Link], and the NASA app for tvOS, which you can download from the App Store on the fourth-generation Apple TV. Android users can watch on Android smartphones, Amazon Fire tablets, and Fire TV devices.
A preview show will kick off at 12:00 p.m. ET, hosted from Charleston, South Carolina, and live coverage will last for four hours. At 1 p.m. ET the main show will begin and continuously cover the path of totality the eclipse will take as it travels across the United States.
The partial eclipse will begin in Oregon at around 9 a.m. PT and totality will occur just over one hour later. The eclipse will then end in South Carolina with a partial eclipse hitting just after 1 p.m. ET and totality occurring approximately between 2 p.m. and 3 p.m. ET. For those in the path of totality, the total solar eclipse will last just a few short minutes (between 2 minutes and 2 minutes and 40 seconds), although the exact duration will vary by location.
The lunar shadow enters the United States near Lincoln City, Oregon, at 9:05 a.m. PDT. Totality begins in the United States in Lincoln City, Oregon, at 10:16 a.m. PDT. The total eclipse will end in Charleston, South Carolina, at 2:48 p.m. EDT. The lunar shadow leaves the United States at 4:09 p.m. EDT. A partial eclipse will be visible throughout the United States.NASA has created a useful interactive map for finding the times when the eclipse will appear near you, as well as how high the obscuration percentage (percent of totality, with higher being darker) will be in your area.
In regards to eye and camera safety, NASA has a wealth of resources to guide you on viewing and recording the eclipse. The organization suggests that you only purchase solar viewers from its list of reputable retailers and vendors. The safety precautions are particularly aimed at the time of the partial solar eclipse, when sunlight can still be seen in the sky.
There's also a document [PDF] that NASA has created on the subject of eclipse smartphone photography, briefing those interested in capturing the eclipse with various tips on getting the best shots. Without a professional camera, tripod, or telescope, most smartphone shots of the eclipse will likely still come out as images with a tiny bright disc in the sky.
NASA warns that smartphones with wide apertures, between f/1.7 and f/2.0 (in terms of iPhones only the iPhone 7's f/1.8 fits in this range), could face potential damage when pointed directly at the sun for long periods. There are steps that can be taken to avoid such a risk, including simply taking quick snaps of the eclipse, covering the iPhone's lens with solar viewer safety glasses, or investing in telephoto lens attachments.
No matter what, be sure to keep solar glasses on at all times when photographing a partial solar eclipse with either a smartphone or professional camera system.
There are plenty of other apps and platforms that the 2017 solar eclipse will be viewable on, including most major media outlets and their own iPhone, iPad, iPod touch, and Apple TV applications.