and that's where the gradients to the clocks come in - even for those users, there's still a mechanism to distinguish those two zones. Monochromacy/Achromatopsia is a close second. The only mode where any two zones next to each other are nearly identical is Red-blind/Protanopia (CMK identical, Y 8% higher in UTC-7 compared to UTC-8†). Grab a screenshot ( ) and drop it in here (.
So the different components of this visualization genuinely solve a few different problems around color-blindness (necessary for 508 compliance is my guess, but I'm not an expert here) > The way the different states are colored according to their time zone and then that color reaching out to the labels on top with those ray-like things is actually pretty clever. There is a basis for this, LORAN did the exact same thing but with an earlier divergence point.
WEB CLOCK PAYROLL SERVERS TIMEPLUS PLUS
GPS time is TAI plus or minus a different offset caused by some of the leap seconds being considered. However, formally, UTC is defined as TAI plus or minus the leap second offset in order to minimize divergence from UT1 (which is a smoothed astronomical time base rather than monotonic). TAI is also, of course, fundamentally just a divergence from UTC caused by not applying leap seconds. The reason I describe it as "no longer applying" is because the GPS time is monotonic from UTC at an arbitrary starting point, so it doesn't match up with any of the strictly monotonic time bases either - that is, GPS time is monotonic but does not match the agreed upon international monotonic time standard, TAI, because GPS time has some of the UTC leap seconds applied. Yeah, so GPS was designed to not apply leap seconds from the start, which is important because there's a field built into the protocol to send the current offset. Because of the simplicity and low cost of GPS time sources, GPS is as ubiquitous for time measurement as it is for navigation. The Navy operates master clock equipment at Schriever AFB for closer proximity to the NIST equipment at Boulder, but the primary means of comparison of the two time bases is by observing the GPS time. Similarly, many of the most significant advances in mechanical timekeeping were spurred by the need for compact and reliable clocks for use at sea. The transit telescope maintained at the Naval Observatory comes from the legacy of the Naval Observatory as a tool to correctly adjust the clocks used by ships at sea for navigation. The Navy, on the other hand, has long been interested in accurate timekeeping because it is required for celestial navigation.
The NIST is interested in timekeeping from a metrological perspective since it is important to many commercial and scientific pursuits. Additionally, the GPS time, while operated by the Air Force, is precisely synchronized to the Navy time plus or minus a known offset (due to the decision to no longer apply leap seconds to the GPS constellation to avoid leap-second-related problems). However, what's perhaps more useful is that the Navy continues to offer a telephone time service (20) while NIST does not. The Navy offers a similar online time service although it is clearly far less developed from a design perspective (. The offset between the two is generally less than the error in the comparison method. By policy the civil and military time are synchronized, and the precise offset between civil and military time is monitored by the NIST as a form of quality assurance. There are two independent timekeeping authorities in the US, the NIST and the Navy, which maintain the official civil and military time respectively.
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