77 Kilometers To Miles – Changing kilometers to miles on Apple Watch is a big challenge. It’s not easy, but I found out how to do it.
Reader Janice wrote that since updating her iPhone to iOS9, her Activity and Apple Watch mileage has gone from miles to kilometers. Tried everything to find an option to change back but no luck.
77 Kilometers To Miles
Genius has gone through the Apple community forums, but there seems to be no consensus on how to do it. Many helpful souls have suggested that the unit of measurement for performance depends on the iPhone’s global settings. Some thought Apple had decided that all UK international settings would be metric by default.
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Of course, none of this is true. Apple will not make this fundamental mistake. As British readers will attest, we have a complete lack of weights and measures in this country. Thirty years ago, we changed halfway, but traditionalists fought hard to maintain imperial greatness. As a result, we’re stuck in a limbo between the good old Imperials and newbies. Canadians, Australians, New Zealanders and others have done it with ease, rapidly changing and are now fully metric. We have a generational gap here and endless confusion.
We drive for kilometers along the road, speed limit signs respectively in miles, and the distance to the next intersection is measured in yards. However, when we stop to refuel, it’s the liter we put in the tank, not the old gallon. We still insist on talking about miles per gallon. To this day, I have only a vague idea of the relative values of different liters per hundred kilometers. It’s a complete mess and the people at Apple know it. However, they have no one to keep Jonny Eve up to date on British English.
No, the answer is actually quite simple. Apple’s only crime is that it doesn’t make it more clear. Janice is right that there is no way to change the units on the watch or in the Activity app on the iPhone. Instead, as I discovered, the option is confusingly hidden in another app, Health. Here’s what to do if you find yourself in a similar situation:
Judging by the social forums, no one seems to have figured it out. Making things harder is unlike Apple, and if I wasn’t sure where the correction was going to be, I probably never would have had the patience to find it. The radius of the Earth (in R🜨 or R E } ) is the distance from the center of the Earth to its surface or nearest point. Estimating the size of the Earth from a sphere, the radius ranges from a maximum of about 6,378 km (3,963 mi) (equatorial radius, dotted a) to a minimum of 6,357 km (3,950 mi). (polar ray, point b).
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The nominal Earth radius is sometimes used as a unit of measurement in astronomy and geophysics, which is recommended by the International Astronomical Union as the equatorial value.
The global mean value is usually taken as 6,371 km (3,959 mi) with a deviation of 0.3% (± 10 km) for the following reasons. The International Union of Geodesy and Geophysics (IUGG) provides three reference values: mean radius (R)
) three radii measured at two equatorial points and one pole; The authalic radius, which is the radius of a sphere with the same area (R
); and the volume radius, which is the radius of a sphere with the same volume as the ellipsoid (R).
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Other ways of defining and measuring Earth radiation include diffuse radiation. Several definitions give values outside the range between the polar radius and the equatorial radius because they involve spatial or geodesic topography or immerse themselves in abstract geometric considerations.
The 2003 IERS scale oblate diagram shows an ellipsoid with north at the top. The light blue area is a circle. The outer edge of the dark blue line is an ellipse with the same minor axis as the circle and the same electric field as Earth. The red line represents the Kerman line 100 km (62 mi) above sea level, while the yellow area represents the ISS altitude range in low Earth orbit.
The Earth’s rotation, internal differential changes, and external tidal forces cause the shape to regularly deviate from a perfect sphere.
Local topography increases variability, resulting in more surface complexity. Our description of the Earth’s surface must be simpler than reality to be acceptable. That’s why we build models of objects close to the surface of the Earth, simply based on a simple model that fits the needs.
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Every commonly used model has some concept of geometric radius. Strictly speaking, spheres are the only solids that have rays, but the broader use of the term rays is common in many fields, including those dealing with models of the Earth. The following is a partial list of Earth surface models, ordered from most accurate to most accurate:
For geoids and ellipsoids, the distance from any point on the model to a given setter is called the “Earth radius” or “Earth radius at this point.”
It is also common to refer to each mean radius of a spherical model as the “ground radius”. On the other hand, given the actual land area, it is unusual to refer to “Riyadh” as there is generally no practical need. Rather, the height above or below sea level is preferable.
Regardless of the model, each radius falls at least 6,357 km from the polar boundary and a maximum of 6,378 km (3,950 to 3,963 mi) from the equator. Therefore, the Earth deviates from a perfect sphere by only one-third, which in most cases supports the spherical model and justifies the term “Earth’s radius”. While the specific values vary, the concepts in this article apply to every major planet.
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The rotation of the planet causes it to be an oblate ellipsoid/spheroid near the bulge at the equator and flattened at the north and south poles so that the equatorial radius a is larger than the polar radius by about aq. is given by the inverse constant q
Where ω is the angular frequency, G is the force of gravity, and M is the mass of the planet.
For Earth, 1/q ≈ 289, which is close to the measured inverse flattening of 1/f ≈ 298.257. Additionally, the bulge at the equator shows slow changes. The bulge has been retreating, but since 1998 the bulge has increased, possibly due to redistribution of oceanic mass in the crust.
Differences in crustal density and thickness cause gravity to vary over the surface and over time, which is why mean sea level differs from an ellipsoid. This difference is the height of the geoid, positive above or outside the ellipsoid, negative below or inside. The geoid height difference is less than 110 m (360 ft) on Earth. The height of the geoid can change rapidly due to earthquakes (such as the Sumatra and Andaman earthquake) or loss of ice (such as Greenland).
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Not all settlements come from Earth. The gravitational pull of the moon or sun can cause the earth’s surface to change by as much as one meter in 12 hours (see Earth tides).
The Albiruni (973-1048) method for calculating the radius of the earth simplified the measurement of the radius of the earth, instead of measuring it from two distant locations.
Considering local and transitive effects on surface height, the values defined below are based on a “general purpose” model, globally within 5 m (16 ft) of the reference ellipsoid as possible and 100 m (330 ft) in. Mean sea level (excluding geoid height).
In addition, the radius can be estimated from the curvature of the Earth at a point. Like a torus, the curvature at a point will be greatest (tightest) in one direction (Earth’s north-south) and least (steepest) in the opposite direction (east-west). The radius of curvature depends on the position and direction of measurement from this point. As a result, the distance to the true horizon at the equator is slightly less in the north-south direction than in the east-west direction.
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In summary, local variations within the region make it impossible to define a single “exact” radius. Only the perfect model can be chosen. Since the conjecture of Eratostes, many models have been developed. Historically, these models were based on the local topography that provided the best reference ellipsoid for the area under study. As satellite remote sensing, and in particular the global positioning system, gained importance, truly global models were developed which, while not accurate for local tasks, were very good approximations of the entire Earth.
This is an idealized surface and the ground measurements used for the calculations have an uncertainty of ±2 m in the equatorial and polar dimensions.
Additional differences can be significant due to topographic differences in some locations. Locating the visible point using more accurate values for WGS-84
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