Time

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• Quantum
• Time ...Coordinated Universal Time UTC ... Clock ...Timekeeping | Wikipedia
• The Very Long and Fascinating History of Clocks | Christopher McFadden - Interesting Engineering
• What Is a Leap Second? | Konstantin Bikos and Anne Buckle - timeanddate.com
• Atomic clocks ...Tide Clock | Amazon
• Cybersecurity
  • Crown Sterling ... changing the face of digital security with its non-integer-based algorithms that leverage time, AI and irrational numbers.
  • Quantum cryptography ... the infosec industry looks to quantum cryptography and quantum key distribution (QKD)
• Time Series
  • Time-based Algorithms
  • A Comparison of Time Series Databases and Netsil’s Use of Druid | Netsil
  • Microsoft announces the general availability of Azure Time Series Insights | Ryan Waite - Microsoft
  • Top 10 Time Series Databases | Outlyer
• Models
  • Transformer
    • Generative Pre-trained Transformer (GPT)
    • Attention Mechanism/Transformer Model
    • Transformer-XL
  • Sequence to Sequence (Seq2Seq)
  • End-to-End Speech
  • Neural Turing Machine
  • Recurrent Neural Network (RNN)
    • Long Short-Term Memory (LSTM)
    • Gated Recurrent Unit (GRU)
    • Bidirectional Long Short-Term Memory (BI-LSTM)
    • Bidirectional Long Short-Term Memory (BI-LSTM) with Attention Mechanism
    • Average-Stochastic Gradient Descent (SGD) Weight-Dropped LSTM (AWD-LSTM)
  • (Tree) Recursive Neural (Tensor) Network (RNTN)
  • Temporal Difference (TD) Learning
  • Time Series Forecasting - Statistical
  • Time Series Forecasting - Deep Learning
  • Spatial-Temporal Dynamic Network (STDN)

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Whenever we have developed better clocks, we’ve learned something new about the world.
- Alexander Smith New Time Dilation Phenomenon Revealed: Timekeeping Theory Combines Quantum Clocks and Einstein’s Relativity - Dartmouth College

The Earth's rotation is so accurate it varies only in milliseconds ...do you feel the Earth rotation slowing down?

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Navigation Aids

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• Longitude: The True Story of a Lone Genius Who Solved the Greatest Scientific Problem of His Time | Dava SobelAmazon ...Video: "Lost at Sea: The Search for Longitude" Nova companion Web site
• Navigation Aids | Department of Transportation, Federal Aviation Administration

GPS: The Global Positioning System

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• Case Studies
  • Agriculture
  • Man-made (artificial) Satellites
  • Defense
• Autonomous Drones
• Deepmind teaches AI to follow navigational directions like humans | Tristan Greene
• Artificial intelligence in GPS navigation systems | Jeffrey L. Duffany
• RoadTagger: GPS system upgrade utilizes AI to make sure you're in the right lane | David Nield - New Atlas ...Artificial intelligence to update digital maps and improve GPS navigation | Amit Malewar - InceptiveMind
• GPS.gov
• Inside GNSS ...Global Navigation Satellite Systems
• Navstar | Space.com ...is a network of U.S. satellites that provide GPS services
• SpaceX launches third-generation GPS navigation satellite | CBS News ...GPS-3 satellite — the fourth in a series of more powerful third-generation navigation stations built by Lockheed Martin — was expected to be deployed about a 90 minutes after liftoff. Assuming tests and checkout go well, it will join a globe-spanning constellation of 31 GPS satellites.
• Air Force asks three U.S. contractors to develop miniature ASIC technology for next-gen GPS receivers | John Keller - Military & Aerospace Electronics ...small low-power-consumption GPS enabling technologies to include a next-generation ASIC for secure GPS land navigation.
• China tipped to 'wipe out' GPS with 'dire consequences' after conflict catalyst exposed | Callum Hoare - The Daily Express ...China could bring the world to its knees by "wiping out" GPS, a key system used by the US military and its NATO allies, an expert on space policy has told Express.co.uk GPS Unreliability | Dennis L. Bryant - MarineLink ...GPS has been copied by Russia's GLONASS, Europe’s Galileo, China's BeiDou, India’s IRNSS, and Japan’s QZSS
• China Launches Beidou, Its Own Version of GPS | Andrew Jones - IEEE Spectrum ...China places the final Beidou navigation system satellite into orbit
• There’s no GPS in outer space
  • NASA is Making An AI-Based GPS For Space | Kristin Houser
  • Frontier Development Lab (FDL) ...Artificial Intelligence Research for Space Science, Exploration & All Humankind

GPS receivers that use the L5 band can pinpoint to within 30 centimeters or 11.8 inches. The GPS concept is based on time and the known position of GPS specialized satellites. The satellites carry very stable atomic clocks that are synchronized with one another and with the ground clocks. Any drift from time maintained on the ground is corrected daily. In the same manner, the satellite locations are known with great precision. GPS receivers have clocks as well, but they are less stable and less precise. Each GPS satellite continuously transmits a radio signal containing the current time and data about its position. Since the speed of radio waves is constant and independent of the satellite speed, the time delay between when the satellite transmits a signal and the receiver receives it is proportional to the distance from the satellite to the receiver. A GPS receiver monitors multiple satellites and solves equations to determine the precise position of the receiver and its deviation from true time. At a minimum, four satellites must be in view of the receiver for it to compute four unknown quantities (three position coordinates and clock deviation from satellite time). Global Positioning System | Wikipedia

Long Range Navigation (Loran)

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• Public-private partnership to launch enhanced LOng RAnge Navigation (eLORAN) technology to back-up and accompany GPS | Jamie Whitney - Intelligent Aerospace

Quantum Sensors in Navigation

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• Review of Quantum Navigation | Donghui Feng - IOP Conference Series: Earth and Environmental Science
• Quantum Sensing Technology Growing Rapidly to Enable Ultra Sensitive Quantum RADARS, Imaging, and Navigation | Rajesh Uppal - International Defence Security & Technology

Time & Music

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• Time & Music