Degrees per hour to Gigahertz

The ISS completes one orbit (360°) in about 92 minutes, giving roughly 235°/hr — almost 16 times faster than Earth's rotation. That is why astronauts see 16 sunrises every 24 hours. At an altitude of ~408 km, the station covers about 7.66 km/s of ground track. If you could watch it from a fixed point in space, it would visibly sweep through the sky at a rate where one degree takes only about 15 seconds.

Because even tiny drift accumulates into serious navigation errors over a flight or voyage. A navigation-grade ring-laser gyroscope drifts less than 0.01°/hr; over a 10-hour flight that is only 0.1° of heading error. A cheap MEMS gyro drifting 10°/hr would accumulate 100° of error in the same time — useless for navigation. Expressing drift in °/hr makes the operational impact immediately obvious to a pilot or engineer.

Equatorial telescope mounts have a motorised right-ascension axis aligned with Earth's rotation axis. By driving that axis at exactly 15°/hr (one sidereal rate), the telescope counter-rotates against Earth's spin, keeping a star fixed in the eyepiece. Without this drive, stars would drift out of view in seconds at high magnification. Astrophotographers rely on it for long exposures without star trails.

The Moon's apparent motion has two components. It shares the sky's overall 15°/hr westward motion due to Earth's rotation. But it also orbits Earth, moving about 0.55°/hr eastward relative to the stars (360° ÷ 27.32 days ÷ 24 hr). The net effect: the Moon moves westward across the sky at roughly 14.5°/hr, which is why moonrise occurs about 50 minutes later each day.

A Foucault pendulum's swing plane rotates relative to the floor at 15° × sin(latitude) per hour. At the North Pole (90°) that is the full 15°/hr; at 45° latitude it is about 10.6°/hr; at the equator it is zero. The pendulum always swings in a fixed plane in inertial space — it is the Earth rotating underneath it. The sine factor comes from the fact that only the vertical component of Earth's angular velocity vector projects into the pendulum's swing plane. Paris (48.9°N) sees about 11.3°/hr, which is why Foucault's original 1851 demonstration took most of a day to complete a visible rotation.

No. Clock speed is only one factor. A modern 3 GHz core can do far more work per cycle than a 2005-era 3 GHz Pentium 4 thanks to wider pipelines, better branch prediction, and larger caches. And a 2.5 GHz chip with 16 cores can outperform a single 5 GHz core on multi-threaded workloads. GHz tells you how fast the clock ticks, not how much work each tick accomplishes.

The 2.45 GHz frequency sits in the ISM band, so it doesn't need a broadcast license. Contrary to popular belief, it is not the resonant frequency of water — water absorbs microwave energy across a broad range. 2.45 GHz was chosen because it penetrates food a few centimeters deep before being absorbed, cooking the interior rather than just scorching the surface. At much higher frequencies, energy would be absorbed in the outer millimeter.

The 2.4 GHz band has longer wavelengths that penetrate walls better and travel farther, but it only has three non-overlapping channels and is congested by Bluetooth, microwaves, and neighbors. The 5 GHz band offers 23+ non-overlapping channels and higher throughput, but signals attenuate faster through walls. Wi-Fi 6E adds the 6 GHz band — even more channels, even shorter range.

Overclocking raises the clock multiplier or base clock in the BIOS, increasing operating frequency beyond the manufacturer's spec. A chip rated at 3.6 GHz might hit 5.2 GHz with extra voltage and aggressive cooling. The risks are heat (silicon degrades faster at high temperatures), instability (random crashes if voltage is insufficient), and reduced lifespan. Extreme overclockers use liquid nitrogen to keep the chip at -196°C for record-breaking single benchmarks.

Millimeter-wave (mmWave) 5G operates between roughly 24 and 47 GHz — frequencies with very short wavelengths (hence "millimeter"). These bands offer enormous bandwidth (up to 800 MHz per channel vs. 100 MHz on sub-6 GHz), enabling multi-gigabit speeds. The trade-off is brutal: mmWave signals are blocked by walls, foliage, even rain. Carriers deploy it in dense urban areas and stadiums where short-range, high-capacity service makes economic sense.