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We’ve already built ternary computers.Ternary logic has some theoretical advantages, such as denser logic and buses to represent roughly the same range of values.And, from a circuitry perspective, you could envision using positive, zero, and negative voltages to represent ternary digits. This would be reasonably compatible with modern transistor technology.However, all of our existing compute infrastructure—including programming languages, numeric formats, and so on—is built around binary computers. Binary computing won in the marketplace, and a huge ecosystem has built up in the subsequent decades. Even decimal computers used binary representations for decimal digits.[1][2][3][4]If you were to build a ternary computer today, you’d also have to build a lot of your own infrastructure. Heck, you’d need to even build your own EDA tools to construct large amounts of logic based on ternary valued signals.For example, suppose you wanted a C compiler. You’d likely have to invent your own dialect of C, with additional operators to represent logic expressions on ternary digits. And, to support existing C code that uses binary digits, your machine would need some method for converting binary values to ternary and back.Suppose you want to talk to the rest of the world. You’d need some mechanism for converting your ternary values to binary, and binary values from the world to ternary.Any imagined efficiency for ternary representation starts to disappear quickly if you spend much time converting to and from binary.And what about human factors issues? Someone has to program this thing. We have handy notations (octal, hexadecimal) for writing numbers in a form such that the bit patterns are obvious. You’d likely have to socialize some new representations—nonary (base 9)?[5] heptavigesimal (base-27)?—to get a corresponding benefit there.So would there be any value to a ternary computer? Perhaps, but only in a really specialized application. For example, if you could figure out a way to build a super energy-efficient ternary processor for an embedded application—a hearing aid or pacemaker—there might be a market for it.But, that device would have to offer a significant advantage over a more traditional binary computer before folks would take the plunge of trying to build it, let alone use it.Footnotes[1] Binary-coded decimal - Wikipedia[2] Aiken code - Wikipedia[3] Excess-3 - Wikipedia[4] Decimal floating point - Wikipedia[5] List of numeral systems - Wikipedia

Even worse than you think…This watch… A Casio Iluminator…It tells time and has a timer. It is more powerful than the guidance computer of Apollo 11.The Apollo 11 guidance computer (that was designed by MIT!) wasn't very powerful, but it didn't need to be. NASA also had power consumption and space requirements for it as well. Most of the number-crunching was done on the ground by these bad boys:Nice Lab-Coats!That's an IBM System/360! It can perform a whopping 34,600 processes a second!The guidance computer basically just needed to perform functions that the Astronauts punched into it. Which they had mostly memorized or had a list that had steps on what to punch in. The guidance computer would then execute those functions.Interesting Facts:Fact #1 Backwards CompatibilityThe applications NASA ran on the System 360 can run on IBM’s latest System Z almost entirely unmodified! 5 decades after they were originally designed! Talk about backwards compatibility!In contrast the PlayStation 4 can run PlayStation 2 games (and only certain ones!) from 10 years ago…Fact #2iPhone 6 vs System 360! ROUND 1! FIGHT! (Sorry was playing street fighter earlier…)The System 360 computers cost $3.5 million a piece and were the size of a car. Each one performs several hundred thousand addition operations per second, and their total memory capacity was in the megabyte range.The iPhone 6 costs $699 and uses an Apple-designed 64 bit A8 processor and it's built on the ARMv8 architecture. It's composed of approximately 1.6 billion transistors. It operates at 1.4 GHZ and can process instructions at a rate of approximately 1.2 instructions every cycle in each of its 2 cores. That’s 3.36 billion instructions per second. Put simply, the iPhone 6’s clock is 32,600 times faster than the best Apollo era computers and could perform instructions 120,000,000 times faster. An iPhone could be used to guide 120,000,000 Apollo era spacecraft to the moon, all at the same time.Holy Crap!

There is no specific use of that Mean Sea Level.People often have a misconception that it helps Loco Pilots to judge the gradient and operate accordingly, but it not be true always; as in between stations the gradient may fall and rise variably.The Loco Pilots have a detailed document with them called Caution Order concerning the speed restrictions and gradient in sections.So, as i said the marking is given as an additional piece of information with no such practical and operational application.