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SRA 48 Town Meeting

 

 

Solar Time vs. Sidereal Time

There is more than one way to measure time. We typically use solar time but we could also also look at sidereal time.

How long does it take Earth to complete a 360-degree rotation? Not quite 24 hours, it turns out - it's precisely 23 hours and 56 minutes.

But because Earth is constantly moving along its orbit around the Sun, a different point on the planet faces the Sun directly at the end of that 360-degree spin.

For the Sun to reach the exact same position in the sky, Earth has to rotate 1 degree further.

That's how humans have chosen to measure days: not by the Earth's exact rotation, but the position of the Sun in the sky.

Technically, these are two different types of day. A day measured by the completion of a 360-degree rotation is called the sidereal day.

A day based on the position of the Sun, however, is a solar day. The latter is four minutes longer than the former, making the even 24 hours we're used to.

"It's only because we move around the Sun in an orbit that the solar day takes 24 hours," James O'Donoghue, a planetary scientist at the Japanese space agency (JAXA), told Business Insider.

"If we didn't orbit the Sun, both days would be the same."

He made the below animation to show how this works. 

Because we go by solar days in our calendars, we count 365 days in a year. But the Earth actually completes a full rotation (a sidereal day) 366 times per year. 

O'Donoghue describes the difference between these two types of day as a matter of choosing which background object we use as a basis of comparison for Earth's rotation. A full rotation relative to the position of the Sun is a solar day. A full rotation relative to all the other stars we see is a sidereal day. 

If we used the sidereal day instead, "the Sun would rise about four minutes earlier every day," O'Donoghue said. "After six months of doing this, the Sun would be rising 12 hours earlier." 

He added: "We've decided to tie our daily rhythm to the Sun, not the stars. In fact, the stars rise about four minutes earlier every day because of our choice."

This article was originally published by Business Insider. It has been edited by Soutenus

https://www.sciencealert.com/quick-animation-shows-two-ways-to-measure-a-day-on-earth-ours-is-4-minutes-longer

Ways we measure time:

Solar Time

Universal Time 0 which is abbreviated: UT0 

Universal Time or UT1 

Universal Time or UT 2 or 

Coordinated Universal Time (UTC)

Sidereal Time  (AKA Star Time)

Ephemeris Time

The Sandwich

The Sandwich

 

Whether it is a PB&J at a picnic or a foot long meatball sub for dinner, sandwiches are a simple, savory, and portable option for any meal of the day. We take them for granted today, but what were the first sandwiches? When did all this deliciousness start? Who invented the sandwich?

 The first recorded mention of a sandwich-like meal dates all the way back to the 1st Century B.C. Ancient Jewish Rabbi Hillel the Elder is reported to have started the Passover tradition of putting lamb, mixed nuts and herbs between two pieces of unleavened bread.

    In the Middle Ages people used thick slices of stale bread, called “trenchers”, as plates for meats and vegetables! That created an open-faced sandwich, although the bread was sometimes too stale to eat.  The bread plate was often fed to dogs and farm animals.

    In the 17th Century, taverns in the Netherlands started to serve something that was a lot more like the sandwiches we enjoy today. They would hang cured beef from the ceilings of the taverns. Then they would cut from these hanging pieces of meat. The sliced chunks of meat were served together with bread and butter for customers.

    Slowly the sandwich started appearing among aristocrats as a late-night meal. The Earl of Sandwich steps into the history of this convenient and delicious part of history. The sandwich got its name from this man. He was an 18th Century English nobleman named John Montague. He was also the 4th Earl of Sandwich, who regularly ordered meat between two pieces of bread. The story goes that he did this because he could enjoy his meat and continue to play cards. He could play and take bites without his hands becoming messy or greasy. Soon people started ordering “the same as Sandwich”, and the name has stuck ever since! Even though he is not the actual inventor of sandwiches, Sandwich is the name that has gone down in history.

    By the 19th Century the sandwich had become popular all over Europe, especially in England because of the industrial revolution. During the industrial revolution, people needed easy-to-make, easy-to-carry lunches that would fill them up for a long day of work. Every class of person enjoyed sandwiches. Today there are sandwiches of all different kinds and flavors and for every situation. People enjoy the bite sized cucumber sandwiches at high tea as well as  a good ol’ ham sandwich in a typical American lunch bag. 

 

QUESTIONS

PART A   How well did you understand?

 

1) How far back can we trace the first sandwich?

a) 1st Century B.C. - Ancient Jewish Rabbi Hillel the Elder

b) Middle Ages "trenchers"

c) 17th Century, taverns in the Netherlands 

d) 18th Century English nobleman John Montague. He was the 4th Earl of Sandwich

 

2) What were "trenchers"?

a) a Philadelphia cheesesteak

b) meat and veggies on stale bread

c) finger sandwiches served at high tea

d) meat and herbs on unleavened bread

 

3) Who was the Earl of Sandwich?

a) Margaret Thatcher

b) Rabbi Hillel the Elder 

c) John Montague  

d) President Biden

 

4) During the industrial revolution, people needed 

a) easy-to-make, easy-to-carry lunches

b) home pizza delivery

c) personal chefs

d) Kosher bakeries

 

5) Bite sized cucumber sandwiches are usually associated with

a) dinner in China

b) football tailgate parties

c) Superbowl parties

d) high tea

 

 

 

B VOCABULARY & HISTORY

Which word or words fit the following definitions?

 

1) This is the quintessential American sandwich found in your school lunches. (Quintessential means the typical example of something)

a) Italian hoagie

b) meat and cheese sandwich

c) egg sandwich

d) Something else. Please describe.

 

2) What years do the "Middle Ages" refer to?  

You may Google this.

 

3) What does unleavened bread mean? 

You may Google this.

 

4) What does it mean that beef is cured?

https://www.thekitchn.com/food-science-how-meat-is-cured-79301

 

5) When was the industrial revolution?  

You may Google this.

 

 

C) THINK ABOUT IT

 

1) What are 3 examples of food you can (politely) eat with your hands?

You may not use the "sandwich" as one of your answers.

a)

b)

c)

 

2) What is “high tea”?

 

3) Twenty years ago, the most common sandwich for kids was peanut butter and jelly. Is this a sandwich you are allowed to bring to school? Why?

 

4) What is your favorite sandwich and why? Write a short essay to answer this question in the form of a fictional essay. Use the 5 senses in your description. (@ least 125 words)  Remember, write a fictional essay that INCLUDES the required info. NOs remain the same.

5) What is yeast? Why is it important for leavened bread? How does it work?

Write a factual explanation that is interesting and accurate. (@ least 125 words)

Use this as your source:

Wednesday Class Homework DUE: 6-3-2020

It was a pleasure to meet you in class today! I was very impressed with your behavior and your participation. I think each of you have growth mindsets!

Your assignment is to write an essay about the speech we watched in class. Share your google doc with me. <keystonewoodlands@gmail.com>

Be sure to cover these points:

1) Tell the reader that you watched a speech about mindsets.

Feel free to share what was important to you in that speech. Let the reader know who gave the speech and how old he was.

2) Explain (define) both mindsets.

3) Give an example from your own life of when you went from a fixed to a growth mindset and the results of changing your attitude.

4) Tell the reader abut the magic word, "yet."  Write at least two examples (sentences) where adding the magic word changes the attitude to a growth mindset.

Be sure to mention the book and the author that Carson Byblow (5th grade) references. The book is Mindsets, by Carol Dweck.

Here is the video in case you would like to re-watch it.

F4 Friday, August 27 --> Friday, September 3, 2021

Friday, September 3

Pick one core and write a story exemplifying it w/ a positive or negative example.

CATS 6 superpowers/why weird?

Andre KWO - needs to write RD and final draft

Aiden - just needs picture to go with essay

Julian -

Kael - upgraded a TW to a portfolio essay (3 Friends) needs moral of the story

•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•

Friday, August 27, 2021

 K,J,A not able to attend. 

Aiden talked back KWO and started working on RD for Cool Cats

•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•

Monday, August 30, 2021

Prayer 

Scripture Races on hold until September (LeaderBoard Ranking: Kael, Andre, Julian, Aiden)

Nature in a Nutshell, by Elaine Egbert

Monday, August 30, 2021   Those Glowing Pulsars  (Psalm 8:9)

Analogy √ could have been stronger or elaborated on more

Scripture relationship √  a response to the text

RD from KWO pg. 45/47 

•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•∞•

Tuesday - finish Covey page 45/47 AND prep for Wed. SSJ

CC Rule

 

1) He wants to visit Rome and Paris.

What is this conjunction:  and

Add a comma if it is needed.

2) Make the bed and then sweep the floor.

What is this conjunction:  

Add a comma if it is needed.

3) Turn left at the light and go all the way to the bridge.

What is this conjunction:  

Add a comma if it is needed.

4) She loves math  yet she gets bad grades in class.

What is this conjunction:  

Add a comma if it is needed.

5) I will drive her to school  so she does not have to walk

What is this conjunction:  

Add a comma if it is needed.

6) It is easy for her.

What is this conjunction:  

Add a comma if it is needed.

7) This is not a root nor is this.

What is this conjunction:  

Add a comma if it is needed.

8) It will be a rainy day or a sunny day.

What is this conjunction:  

Add a comma if it is needed.

9) They want burgers but they have no money.

What is this conjunction:  

Add a comma if it is needed.

10) The want burger but have no money

What is this conjunction:  

Add a comma if it is needed.