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Standard Time

By Jay Ryan at Homeschool-Articles.com

In the modern world, we use “Standard Time” in which the whole world is divided into 24 time zones. As a result, on any day of the year at any latitude, the times of actual sunrise and sunset vary depending on your location within a time zone — the Sun rises and sets earlier in the eastern end of a time zone, and later in the western end of a time zone.

Standard Time and Daylight Savings are conveniences of our modern world, but this whole scheme tampers with the classical practices of astronomical timekeeping. Throughout history, time was measured according to “Sundial Time.” “12 Noon” was simply the time when the Sun reached it’s highest point in the sky, directly above Due South. Each person saw Noon at a unique time for that location. One sundial would point to Noon while a sundial 50 miles away would read differently by a few minutes.

This system worked fine until our current modern period where inventions of the telegraph and the railroad enabled high speed transportation and communication, requiring a common standard reference for telling time. The problem is, with the current system, the Sun no longer reaches its highest point in the sky at 12 Noon.

Nowadays with Standard Time and Daylight Savings, the Sun can reach “High Noon” in the sky as late as 1:30 PM. The modern system of timekeeping plays havoc with the natural order of “Sundial Time.” Thus, timekeeping is now decoupled from God’s natural timekeepers, the Sun and Moon. Perhaps this is one reason why so few people today understand or appreciate Classical Astronomy, since we no longer take our time directly from the Sun. Sundials can be corrected for Standard Time and Daylight Savings, but not many people today know the tricks. So nowadays most sundials are simply lawn decorations, but not useful as timekeepers.


Jay Ryan is the author of Signs and Seasons, an illustrated, Biblically-centered homeschool curriculum for Classical Astronomy. He is also the creator of the Classical Astronomy Update, an email astronomy newseltter especially for Christian homeschoolers.  Visit his website at ClassicalAstronomy.com.

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How Gifted Kids Learn to Read

By Deborah L. Ruf, Ph.D.

One of my doctoral studies’ advisors specialized in how people learn to read. I paid little attention to that research at the time, and by the early 1990’s, my own understanding was still mostly anecdotal or from my own experiences. I had some personal family stories, taught school in a very intellectually diverse community, seen differences between generations and when they started to read, and watched my own three children’s learning paths.

When I was a little girl in the 1950’s, my mother read Dr. Spock’s baby book and anything else she could get her hands on to make sure she was doing all the “right things.” Parents were told not to push their children. This meant that many in my generation were not encouraged to read before starting school. “Don’t interfere with what the trained educators will teach your children,” our parents were told. So, I started school not knowing how to read, although I certainly knew how to sight read many signs, logos, record labels and book titles because I’d memorized their associations, e.g. we stop at the “stop” sign. When I started school, my mother was alarmed that I wasn’t learning to read. She made flash cards and taught me phonics. I remember the hardest word in the stack of flashcards for me was “baby.” How do you phonetically sound out “baby”? I kept saying “baa-bye,” which rhymes with rabbi. My mother was a yeller. This was not a good experience.

Then one day when I was about 7 years old, I simply started to read. The first book I read was Lassie Come Home by Erik Knight. One day I couldn’t read … and the next day I could literally read and understand anything. I see this with my client children all the time except that it usually happens when they are younger than I was. My own children’s father grew up a 1,000 miles away from me, but he experienced much the same reading delay as I had. He got very ill when he was in second grade—still not a reader—and the school sent a tutor to his home to work with him while he was recuperating. Same thing happened; he went from not reading to reading anything – in one day. What happened?
My mother, on the other hand, born in 1927, came from a generation that got to do what they were ready to do whenever that time arose. Grade skipping was common. If a child was ahead of age-mates, she got moved up a grade level or two to learn with older students. My mother was the fourth child in her family. One summer morning when she was four years old, she walked to the public library and wanted to take some books home. The librarian told her she needed a library card. “How do you get a library card?” she asked. “You have to know how to read,” came the answer. Mom ran home, confronted an older brother, and told him she needed to learn to read “right now!” She went back for her library card—and some books to bring home—that afternoon.

I currently tell parent clients that gifted kids learn to read after they develop their vocabularies and learn to know what should come next in a sentence. The brighter the children, the earlier they start absorbing verbal—language—information from their surroundings. Phonics is a useful tool later, but teaching smart children to read with phonics is very confusing to most of them and sometimes slows them down. Phonics works to teach “decoding” skills, but a child who knows how to decode still may not understand what he reads. Most really bright children appear to start reading almost spontaneously. Most parents of such children report that they aren’t sure how their children learned to read.
Bright kids learn to read when they are exposed to how the printed word gives information or tells a story. There are studies showing that the parents of poor children use fewer words with their children, read to them less, and have fewer books in their homes than do typical parents from higher socioeconomic status groups and even some specific racial and ethnic groups. But the big question is this: is it equally effective for all children—regardless of the intellectual abilities and overall interests that the children individually possess— for parents, teachers, and other adults to talk and read to them more? Our public school policy is largely driven by the assumption that all children learn to read the same way and with the same tools and approach. Will providing the same level of vocabulary, conversation, books in the home, and parents who read to them turn the vast majority of American children into capable, high-level readers? Right now the adult literacy rate in the United States is only about 86%. But even that number is misleading because regular reading for information or pleasure is done by only a very small percentage of our population.

It is precisely these questions that makes typical public school classes so problematic for so many gifted children and their parents. For example, research by McCoach & Reis at the University of Connecticut shows that gifted children learn more over the summer than during the school year. Although some interpret this as proof bright children come from stimulating rather than impoverished homes, I propose it is more often due to these smart children finally being freed to read and learn what they are ready to learn—at their own pace and in their own time. The No Child Left Behind school day is set for the majority of learners, not the brightest ones who are still required to be there with others their age who learn much differently and more slowly.

Studies consistently show that the brighter the child, the earlier in their lives they start to absorb vocabulary, normal sentence structure, and the nuances of language in general. When Sesame Street first aired, the goal was to give children in poverty the same early start as their higher socioeconomic counterparts. This is one reason I ask new clients when it was that their children started to pay attention to television, movies, and videos. How early in their lives did they begin to absorb language and verbal skills from their environment? The Sesame Street study uncovered the fact that there appears to be a difference not in how much parents from different socioeconomic groups use TV as a babysitter, but in what the preferred TV programs were for children from each group. Brighter children have an earlier ability to attend—pay attention to—educational programming than do less intelligent children regardless of whether they live in poverty or affluence. Gifted children start learning sooner than other children. They start school “better prepared” because their intellectual profile allows them to absorb sooner and more intensely from whatever environment they are in. Please note that the excellent article linked here—like most educational policy examinations—does not adequately address how intellectual level and profile affects readiness.

Because most children have no options except to attend public schools, it is imperative that those schools instruct all children appropriately–taking their abilities and readiness into account–if they are to learn. It is not true that “by third grade (or fourth grade) we can’t even tell who the early readers were.” It is an unacceptable excuse for keeping all children of the same age in the same classes for instruction. I’ll talk about the topic of gifted children and reading much more in future blogs.

This article has been reprinted with permission from the author.  She says this about her website:  “I founded Educational Options to provide accurate information regarding intelligence, what it is, where it comes from, and how our family, school, relationship and workplace environments either nurture or stifle its expression. When someone is highly intelligent – different from the majority in thoughts, expression, and interest – the wrong environment can lead to confusion, sadness, and underachievement. My continuing purpose is to open the eyes and awareness of adults in ways that will benefit them and the children under their care.”

Check out Dr. Ruf’s latest project at http://www.talentigniter.com/, especially the page on Ruf Estimates of Levels of Gifted Assessments.

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Everyday Science: Contrails

It’s fall, and that means leaves falling, pumpkin pie baking, calendars rapidly filling, and ….. contrails forming.  So what exactly is a contrail?

Contrails (short for condensation trail) are man-made “clouds” created by aircraft engines when the temperature and humidity conditions are just right.  Usually occurring at temperatures below -40°C, and at altitudes above 26,000 ft, contrails are formed when water vapor condenses and then freezes on the particulate matter in aircraft exhaust.  To form a contrail, the temperature must be low enough or the humidity must be high enough for water to condense on the exhaust particles.  Since the process of condensation is well understood, it is possible to predict when contrails will form based on prevalent temperature and humidity conditions.

Typically, with fall weather comes cool, moist air aloft and conditions at are perfect for contrail production.  Think about it: do you see very many contrails in the summer months when it is hot and dry?  Sometimes contrails dissipate rapidly with high winds or high turbulence aloft, and sometimes contrails linger for quite some time.  Contrails dissipate rapidly with low humidity, since the newly formed ice crystals evaporate quickly.  With high humidity, persistent contrails are visible, as ice crystals grow in size, absorbing water from the surrounding (humid) atmosphere.  You might see a contrail which has been stationary for some time right next to one which is dissipating rapidly.  These contrails are at different altitudes, with different conditions at each level.

Since different gas composition, exhaust gas temperatures, and water vapor content exist in different aircraft engines, not all aircraft engines will produce a contrail at the same altitude (with identical weather conditions) at the same time.  Contrail formation has nothing to do with the type of aircraft or its speed.

Another form of contrail is produced when a portion of an aircraft such as a wingtip or winglet causes air cavitation in humid conditions.  Have you ever seen these vapor trails, perhaps at an airshow, when aircraft flying low over the airfield pitch up rapidly in high humidity conditions?  And since we’re mentioning winglets (shown below), you might be interested to know why they’re on the wing.  The winglet serves to reduce aerodynamic drag so the aircraft burns less fuel in flight.  This fuel efficiency is created by breaking up the turbulent wingtip vortices (pronounced VOR-ti-sees) produced by the pressure differential between the bottom and top of the wing.  No vortices = less drag.

Southwest Winglets

Back to the contrails, though… have you ever seen patterns in the sky produced by contrails?  Perhaps all paralleling one another or converging on a point?

This is no coincidence.  The world is criss-crossed with jet routes flown by all aircraft above a certain altitude.  At the junctions of jet routes are navigational aids, which you may have seen while driving or flying yourself.  Here is one navigation aid (navaid) in Oregon, shown courtesy of Wikipedia:

The aircraft whose contrails you see are each navigating with navaids similar to the one shown above.  Therefore the aircraft fly over the navaids as they transit the jet routes.  Parallel tracks of contrails are aircraft flying along the same route.  If you are ever curious about a contrail track you observe, you can check http://flightaware.com.  A screen shot near Dallas, Texas shows multiple aircraft tracks transiting along an east-west jet route using navaids.

Contrail predictions have been used since WWII, when the ability to spot enemy aircraft “conning” could make the difference in advance notice of an airstrike or positioning for air combat.  Here’s a graphic from p. 55 of the March 1943 edition of Popular Science identifying two types of vapor trail formation:

How about an activity to predict contrail formation?  NASA has an activity page where you can access  an Appleman chart.  Using the chart, you can construct a temperature profile to forecast contrail activity in your area.  The activity (recommended for 5th grade and up) begins this way:

…”Military planners have been interested in condensation trail (contrail) forecasts since World War II. Contrails can make any aircraft easy to locate by enemy forces, and no amount of modern stealth technology can hide an aircraft if it leaves a persistent contrail in its wake. In 1953, a scientist named H. Appleman published a chart that can be used to determine when a jet airplane would or would not produce a contrail. For many years, the US Air Force Global Weather Center used a similar chart to make contrail forecasts.

The first published reports of contrail formation appeared shortly after World War I. At first, scientists were not sure how contrails formed. We now know that they are a type of mixing cloud, similar to the cloud that sometimes forms from your breath during a cold winter day. Appleman showed that when the air outside of the airplane is cold enough and moist enough, the mixture of the jet exhaust and the air would form a cloud.

An example of a contrail-forecasting chart is shown below. We will use the chart to make our own forecasts, and make observations to determine whether they are true or false.

Appleman Chart

… Using either the temperature information provided by the teacher or the temperatures obtained from an Internet location (see note below), complete the table on the “Student Data Sheet”, then plot the temperatures corresponding to each pressure level on the “Appleman Chart: Student Graph Worksheet”. Connect the points to create a temperature profile of the atmosphere.

Note: Temperature and humidity information can be obtained from weather balloon soundings launched twice a day from several locations around the country. Several locations on the Internet including http://weather.uwyo.edu/upperair/sounding.html provide detailed sounding information. Choose the location nearest your school.”

This activity would make a perfect accompaniment to a physical science class, a weather unit study, or just a fun diversion.  If you have a weather station in your home, it would pair up nicely as an associated activity.  For younger elementary students, the NASA site also has a word search and a downloadable “Clouds and Contrails” craft.  Have fun!

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