Comment Re:Rather far north. (Score 1) 151
Equatorial orbits are aligned close to the equator. The most useful one are geosynchronous (slight inclination so its ground track is a small figure-8 called an amalemma) or geostationary (zero inclination so they stay above the same spot on the equator). The satellites stay above the same general spot on earth, so are always "visible" to ground stations and satellite dishes. These orbits have to be about 36,000 km above the earth's surface to match the earth's daily rotation (23h 56m). Lower altitude equatorial orbits aren't as useful because their ground track is limited to a swath of latitudes centered around the equator. The primary reason they're used is because of your point (2) - they take less energy to achieve if you launch from close to the equator. If you just want to be in space and don't particularly care about where in space (e.g. the ISS), an equatorial low earth orbit is your cheapest option.
Polar orbits are aligned to pass over the poles (or close to it). These are the second-most useful orbits because they allow a satellite to observe 100% or nearly 100% of the earth's surface. Scientific data-gathering and spy satellites are put into polar orbits. (Do note that because the poles tend to be rather cold and uninhabited, and because a satellite's altitude lets it peer beyond its max orbital latitude, you can get near-100% coverage of the populated regions of the earth with a highly inclined equatorial orbit. But the more you incline the orbit, the less benefit there is from launching near the equator. For a polar orbit which passes directly over the poles, you actually have to spend energy and fuel to get rid of any sideways velocity imparted by the earth's rotation at the launch site.)