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Time & Frequency Services

The National Institute of Standards and Technology is responsible for maintaining and disseminating official time in the United States. While NIST does not have a direct role in implementing clock changes for daylight saving time, it does play an important role in ensuring that timekeeping systems across the country are accurate and consistent.

Prior to the implementation of daylight saving time, NIST issues public announcements reminding individuals and organizations to adjust their clocks accordingly. NIST also provides resources to help people synchronize their clocks, such as the time.gov website and the NIST radio station WWV.

In addition, NIST is responsible for developing and maintaining the atomic clocks that are used to define Coordinated Universal Time (UTC), the international standard for timekeeping. UTC is used as the basis for all civil time in the United States, and it is the reference time used by many systems, including the Global Positioning System (GPS) and the internet.

Overall, while NIST does not have a direct role in implementing clock changes for daylight saving time, it plays an important role in ensuring that timekeeping systems across the country are accurate and consistent, which is essential for the smooth implementation of any changes to the system.

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Time Realization and Distribution

Horologiorum

Rain & Lightning

The thunderbolt steers all things.
—Heraclitus, c. 500 BC

After the rain. Personal photograph taken by Mike Anthony biking with his niece in Wirdum, The Netherlands

Today at 15:00 UTC we examine the technical literature about rainwater management in schools, colleges and universities — underfoot and on the roof.  Lightning protection standards will also be reviewed; given the exposure of outdoor athletic activity and exterior luminaires.

We draw from previous standardization work in titles involving water, roofing systems and flood management — i.e. a cross-cutting view of the relevant standard developer catalogs.   Among them:

American Society of Civil Engineers

American Society of Plumbing Engineers

ASHRAE International

ASTM International

Construction Specifications Institute (Division 7 Thermal and Moisture Protection)

Environmental Protection Agency | Clean Water Act Section 402

Federal Emergency Management Agency

FM Global

Sustainable Sites Initiative

IAPMO Group (Mechanical and Plumbing codes)

Institute of Electrical and Electronic Engineers

Heat Tracing Standards

International Code Council

Chapter 15 Roof Assemblies and Rooftop Structures

Why, When, What and Where Lightning Protection is Required

National Fire Protection Association

National Electrical Code: Article 250.16 Lightning Protection Systems

Lightning Protection

Underwriters Laboratories: Lightning Protection

Underground Stormwater Detention Vaults

United States Department of Agriculture: Storm Rainfall Depth and Distribution

Risk Assessment of Rooftop-Mounted Solar PV Systems

Readings: The “30-30” Rule for Outdoor Athletic Events Lightning Hazard

As always, our daily colloquia are open to everyone.  Use the login credentials at the upper right of our home page.

“Rainbow Connection”

The “lightning effect” seen in carnival tricks typically relies on a scientific principle known as the Lichtenberg figure or Lichtenberg figure. This phenomenon occurs when a high-voltage electrical discharge passes through an insulating material, such as wood or acrylic, leaving behind branching patterns resembling lightning bolts.

The process involves the creation of a temporary electric field within the material, which polarizes its molecules. As the discharge propagates through the material, it causes localized breakdowns, creating branching paths along the way. These branching patterns are the characteristic Lichtenberg figures.

In the carnival trick, a high-voltage generator is used to create an electrical discharge on a piece of insulating material, such as acrylic. When a person touches the material or a conductive object placed on it, the discharge follows the path of least resistance, leaving behind the branching patterns. This effect is often used for entertainment purposes due to its visually striking appearance, resembling miniature lightning bolts frozen in the material. However, it’s crucial to handle such demonstrations with caution due to the potential hazards associated with high-voltage electricity.

 

“Gelukkige Koningsdag!” Stamppot

Stamppot is a Dutch comfort food known for its simplicity and versatility. It combines mashed potatoes with various vegetables, typically leafy greens like kale (boerenkool), endive (andijvie), or sauerkraut (zuurkool), and often includes bacon or sausage.

The name “stamppot” comes from the Dutch words “stampen” (to mash) and “pot” (pot). The dish is prepared by mashing the boiled potatoes and vegetables together in a single pot. The result is a  slightly chunky mixture of mashed potatoes and vegetables.

There are many variations of stamppot, depending on the vegetables used. The most common types include boerenkool stamppot (kale stamppot), andijvie stamppot (endive stamppot), and zuurkool stamppot (sauerkraut stamppot). Each variation has its own distinct flavor and texture.

Stamppot runs deep in the Netherlands and is considered a staple of Dutch cuisine. It’s a dish that brings people together, especially during the traditional “Hutspot Day” (Hutspotfeest) celebrations in some regions.

 

Related: Dutch Student Stew

“Dutch Student Stew” also known as “Hutspot” in Dutch. It’s a traditional Dutch dish that consists of mashed potatoes, carrots, and onions, often flavored with salt, pepper, and sometimes bacon. It’s a hearty and simple comfort food that has been popular in the Netherlands for many years. The name “Dutch Student Stew” might be a colloquial or humorous reference to the fact that it’s an easy and inexpensive dish to prepare, making it suitable for students or anyone on a budget.

Nederland

Seder Plate

The Beginner’s Guide

 

 

 

 

 

 

 

 

 

 

University of Michigan

American Jewish University

University of Richmond

Stanford University

University of Chicago

Harvard Chabad

Passover ‘A Cappella’

Language

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Practical Jokes 2024

Math Professor Fixes Projector Screen

Binary Test Result

Quick Adjustment

Keeping MIT Weird

Fake Professor

Hosanna to the Son of David

Matthew 21:1-11 recounts the events of Palm Sunday, the triumphal entry of Jesus into Jerusalem:

1 As they approached Jerusalem and came to Bethphage on the Mount of Olives, Jesus sent two disciples, 2 saying to them, “Go to the village ahead of you, and at once you will find a donkey tied there, with her colt by her. Untie them and bring them to me. 3 If anyone says anything to you, say that the Lord needs them, and he will send them right away.”

4 This took place to fulfill what was spoken through the prophet: 5 “Say to Daughter Zion, ‘See, your king comes to you, gentle and riding on a donkey, and on a colt, the foal of a donkey.'”

6 The disciples went and did as Jesus had instructed them. 7 They brought the donkey and the colt and placed their cloaks on them for Jesus to sit on. 8 A very large crowd spread their cloaks on the road, while others cut branches from the trees and spread them on the road. 9 The crowds that went ahead of him and those that followed shouted, “Hosanna to the Son of David!” “Blessed is he who comes in the name of the Lord!” “Hosanna in the highest heaven!”

10 When Jesus entered Jerusalem, the whole city was stirred and asked, “Who is this?”

11 The crowds answered, “This is Jesus, the prophet from Nazareth in Galilee.”

The term “Hosanna” originates from Hebrew and is often translated as “Save, we pray” or “Save us, we pray.” It is an expression of adoration, praise, and supplication.  It’s origins lie in the events of Palm Sunday, which commemorates Jesus Christ’s triumphant entry into Jerusalem. According to the Gospels, Jesus rode into Jerusalem on a donkey while crowds of people laid palm branches and their cloaks on the road, shouting “Hosanna to the Son of David! Blessed is he who comes in the name of the Lord! Hosanna in the highest heaven!”

Mechanical Clock from 1895 Still Ticking

Located in the Mechanical Engineering Building this clock has been keeping time for over 120 years and its ticking can be heard throughout the building. The clock was built by the Seth Thomas Clock Company and was installed in 1904.

The clock’s mechanism is powered by weights that are wound up manually twice a week. It has a pendulum that swings back and forth, keeping time with remarkable accuracy. The clock is also equipped with a chime that rings every quarter hour, as well as a striking mechanism that sounds the hours.

Over the years, the clock has undergone several renovations and restorations to keep it in good working order. In 2009, the clock was fitted with an electric motor to assist in winding the weights, but it still operates primarily through mechanical means.

Original Heavilon Hall clock installed in Gatewood Wing

Copeland “American Symphony No. 3”

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Sir Tim Berners-Lee

 

 

 

 

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