GPS Block III on Hold

Since GPS achieved Fully Operational Capability on July 17, 1995, GPS has become an essential navigational tool for civilians and military alike. Keeping the system up-to-date has proved to be a problem. Originally the system was supposed to be up and running in February of 2016 but has been delayed at least until 2023.
The latest iteration of the GPS satellite array is called GPS Block III. These satellites must be launched (and will greatly increase navigational accuracy) in order to keep the Navstar global positioning system operational.
The satellites have already been built by Lockheed-Martin and consist of ten new, advanced satellites to be launched into orbit by SpaceX Falcon rockets. The hold up is the U.S. government wanting to make sure the hardware actually gets up there as they independently seek to confirm the safety and reliability of the SpaceX rocket systems.
The new GPS satellites will boost additional easier to track signals for civilian navigational uses and a Military code (M-1) providing anti-jamming security use for the military.

Why does the moon revolve around the earth?

It just moves forward. The moon isn’t stationary. It has inertia and no atmosphere in space to slow it down. It just goes. As it moves forward, the gravity of Earth tugs on it and it falls, but because it’s moving forward it misses Earth as it falls and goes around, again and again. That’s called an orbit.

Simply said.

How many main longitudes are there in the earth?

The answer is infinite. It’s like asking how many pieces can slice out of a pie. Or like asking if I take a pie and eat half of what’s there each day, will I ever finish the pie?
Longitude merely slices the planet into vertical pieces. You can have an infinite number of those slices. Principally, any sphere or circle has 360 degrees. Each degree is a longitude, and any slice thereof. If fact, wherever you stand on Earth is a longitude, and you can look it up with certain apps on your smart phone.
But in terms of whole numbers, a circle has 360 degrees. Each degree has 60 minutes. Kinda like a big clock.

How does Google know about slow moving street traffic in real time?

This is a great question! I wondered about it myself.

It turns out that every time you have GPS turned on using an Android device, Google can detect how fast you’re moving. If a lot of devices indicate that traffic is moving slowly in a particular area then the conclusion is there is a traffic problem.

This information is shared to other Android users using GPS by indicating that traffic is slow in particular areas.