Earth is Farthest From the Sun Today

Despite the warm and humid weather today, our planet is actually at its farthest point from the Sun today. According to the U. S. Naval Observatory, the Earth reached a point in its orbit called "aphelion" at 3:41 p.m. EDT. The Earth's aphelion is the point where it is the farthest from the Sun than at any time during the year at a distance of 94,506,507 miles.

The Earth is typically about 93 million miles from the Sun. However, because our planet's orbit is not a perfect circle but an ellipse, it has a farthest point and a closest point to the Sun. In case you're wondering, the Earth's closest approach to the Sun is called perihelion, and that occurs in early January. The Earth is exactly 3,104,641 miles (or 3.28 percent) farther from the Sun than at its closest approach. The Earth actually receives about seven percent less heat at its aphelion than at its closest approach, according to researchers.

Although the date for both will vary from year to year, the Earth will always be closest to the Sun in early January and the farthest away in early July. Not surprisingly, that comes as a surprise to most people. At perihelion, our planet is about 91 million miles from the Sun. It moves outward to about 95 million miles from the Sun at aphelion. Naturally, some people have the mistaken impression that our seasons are caused by the changes in Earth's distance from the Sun, but this is not the case.

The temperatures and the seasons are not affected by the proximity of the Earth to the Sun or even the rotation of the planet on its axis. Rather, it is the tilt of the Earth that determines the climate. When it is at perihelion in January, the Earth is tilted away from the Sun in the Northern Hemisphere, and the sunlight is not "getting a direct hit" on the Earth's atmosphere. However, when it is at aphelion in July, the Earth is tilted toward the Sun.

Today's high temperature at Sikorsky Memorial Airport in Stratford was 81 degrees at 11:25 a.m., and the low temperature was 66 degrees for a 74-degree average. That's exactly normal for the date. So, even though it was a good day for the beach or pool, the Earth was actually at its farthest point from the Sun in its annual orbit.

Paul

The 'Dog Days' of Summer Have Officially Arrived

The “Dog Days” of Summer officially start today. No, that’s not because I relented and turned on the air conditioners. Most people casually refer to the "Dog Days" as a period of hot and humid weather. But did you know that the dog days are a 40-day period which lasts from early July through mid-August?

The dog days of Summer run from July 3 through August 11 in the Northern Hemisphere and have to do with the star Sirius, known as “the dog star.” Sirius is the brightest star in the Northern Hemisphere other than the Sun, and it is found in the constellation Canis Major; thus the name “dog star.”

In the Summer, Sirius rises and sets with the Sun. During late July, Sirius is in “conjunction” with the Sun. The ancients believed that its heat added to the heat of the Sun, creating a stretch of hot and sultry weather. They named this period of time, from 20 days before the conjunction to 20 days after, the “dog days” after the dog star.

In ancient times, when the night sky was unobscured by artificial lights and smog, different groups of peoples in different parts of the world drew images in the sky by “connecting the dots” of stars. The images drawn were dependent upon the culture.

The Chinese saw different images than the Native Americans, who saw different pictures than the Europeans. These star pictures are now called constellations, and the constellations that are now mapped out in the sky come from our European ancestors.

They saw images of bears (Ursa Major and Ursa Minor), twins (Gemini), a bull (Taurus), and others, including dogs (Canis Major and Canis Minor). The brightest of the stars in Canis Major (the big dog) is Sirius. The star can be seen prominently in the Winter in the Northern Hemisphere, adjacent to Orion the Hunter.

The conjunction of Sirius with the Sun varies somewhat with latitude. Also, the constellations today are not in exactly the same place in the sky as they were in ancient Rome. Although we are in the middle of the dog days of Summer right now, the heat is not due to the added radiation from a far-away star, regardless of its brightness. The heat of Summer is a direct result of the earth’s 23.5 degree tilt on its axis, meaning the Northern Hemisphere is tilted toward the Sun during the Summer.

Welcome to the "Dog Days."

Paul

Previewing the Month of July

Half the year is over. Now that July is here, it’s time to look ahead at what the month brings climatologically to southwestern Connecticut. I'm sure you remember the record heat wave two years ago. The temperature climbed to 90 degrees July 14 and reached into the 90s the next six days for a seven-day heat wave. That was unprecedented across southwestern Connecticut. In fact, we also experienced a four-day heat wave from July 5 through July 8.

Not surprisingly, July is the warmest month of the year with a mean temperature of 74 degrees. The hottest temperature ever recorded at the airport happened  July 22, 2011, when the mercury topped 103 degrees, tying the record originally set in 1957. The following day, July 23, 2011, another record high of 96 degrees was recorded.

The mercury reached the century mark two other times — July 2, 1966 and July 5, 1999. In fact, the average daily temperature climbs from 72 degrees at the start of the month to 75 by July 31. July of 2013 was the warmest on record with an average temperature of 78.5 degrees, breaking the previous mark of 78.4 degrees in 1994.

July of 2010 was another hot one. You may recall the heat wave over the Independence Day holiday weekend five years ago. The high temperatures from July 4 through July 7, 2010, were 97, 93, 98, and 95 degrees, respectively. In fact, record high temperatures were established July 6 and 7. The mercury also reached 95 degrees July 24. The average temperature for the month was 78 degrees, a half-degree shy of the all-time record set in 2013.

Many people have asked me why the hottest time of the year happens over a month after the first day of Summer. Well, it takes the Earth awhile to absorb the heat. As the Sun’s angle gets higher in the sky and the days grow longer in May and June, the Northern Hemisphere slowly starts to warm.

It’s much like warming your home. When you turn your thermostat up to 72 degrees after being away all day in the Winter, it will take awhile for the house to warm up. It doesn’t happen instantly. That’s why our hottest days are typically in July and early August.

On the flip side, the coolest temperature ever recorded in these parts in July was 49 degrees on July 1, 1988. Aside from that, every record low for the month is in the 50s. Believe it or not, according to the National Weather Service record book, a trace of snow fell at the airport on July 4, 1950. I find that too hard to believe.

As far as precipitation is concerned, the wettest July on record happened in 1971 when over a foot of rain (12.84″) fell. The average monthly rainfall is 3.77 inches. There have been several memorable rainstorms in July. For example, nearly a half-foot (5.95″) of rain fell on July 19, 1971, and nearly four inches (3.93″) was recorded on July 29, 1990. Two other days delivered well over three inches of rain — July 30, 1960 (3.57″) and July 23, 1953 (3.45″).

The length of daylight actually decreases this month. For example, today, the Sun rises at 5:23 and sets at 8:30. By the middle of the month, on July 15, the Sun rises at 5:32 and sets at 8:24. However, at the end of the month, it rises at 5:47 and sets at 8:10, meaning we lose 44 minutes of daylight. Remember, the “longest” day of the year happened at the Summer Solstice in late June.

Enjoy July!

Paul

July's Full Buck Moon Precedes Full Blue Moon

I'm sure you've noticed the waxing Moon in the sky over the last few days. Even though it appeared nearly full and brilliant last night, the Full Buck Moon happens at 10:20 p.m. EDT Wednesday. Unfortunately, our skies will be mostly cloudy tomorrow evening, but we'll have another chance to see the full moon the last day of the month.

The "Blue Moon" happens July 31. There are, in fact, two definitions for a blue moon. According to the more recent definition, a blue moon is the second full moon in a calendar month. For a blue moon to occur, the first of the full moons must appear at or near the beginning of the month so that the second will fall within the same month (the average span between two moons is 29.5 days).

The older definition, which is recorded in early issues of the Maine Farmer's Almanac, states that the blue moon is the third full moon in a season that has four full moons. Why would one want to identify the third full moon in a season of four full moons? The answer is complex, and has to do with the Christian ecclesiastical calendar.

So, how did July's full moon get its name? It is normally the month when the new antlers of buck deer rush out of their foreheads in coatings of velvety fur. It is also often called the Full Thunder Moon, since thunderstorms are common during this time of the year. Another name for this month’s Moon is the Full Hay Moon.

Full Moon names date back to Native Americans in what is now the Northern and Eastern United States. The tribes kept track of the seasons by giving distinctive names to each recurring Full Moon. Their names were applied to the entire month in which each occurred. There was some variation in the Moon names, but in general, the same ones were current throughout the Algonquin tribes from New England to Lake Superior.

A Full Moon rises at about the same time the Sun is setting. Since the length of daylight is about 15 hours and six minutes tomorrow, the Full Moon will rise later and set earlier this time of the year. In addition, the Full Moon will appear lower in the sky since it won’t be visible nearly as long as during the mid-Winter nights.

For example, the Moon rises at 7:57 Wednesday evening and sets at 6:07 Thursday morning. That means the Moon will be visible for 10 hours and 10 minutes. Conversely, six months from now in January when the amount of daylight is at a minimum, the Full Wolf Moon will appear higher in the sky and be visible for about 17-and-half-hours. That’s over eight hours longer than this time of the year!

Paul

Tornado Ripped Through Bridgeport Five Years Ago Today

It only took a matter of minutes, but a violent thunderstorm spawned a tornado which ripped through the Greater Bridgeport area three years ago today, resulting in much damage, destruction, and a loss of electricity for thousands. A powerful cold front collided with a hot and humid air mass to set the stage for a Tornado Warning and a strong thunderstorm cell between 2 and 3 o'clock Thursday afternoon, June 24, 2010.

The temperature soared to 90 degrees for the second day in a row at Sikorsky Memorial Airport in Stratford that day, but the dew point --- or moisture content in the atmosphere --- was extremely high. As the front approached, the sky darkened, the heavens opened up, and vivid lightning along with hurricane-force wind gusts ripped through the Park City. Here is a photo of Washington Park in Bridgeport taken by one of our viewers, Melissa, following the storm.

There was dangerous cloud-to-ground lightning and a wind gust of 78 miles-an-hour in Bridgeport. The average wind speed during the height of the storm was 43 miles-an-hour. Nearly a half-inch of rain fell in a short period of time, resulting in some minor flooding of low-lying areas. But, it was the wind damage which caused a state of emergency to be declared in Bridgeport. Take a look at this picture of a fallen tree in the Park City taken by Takina.

Bridgeport Mayor Bill Finch and former Governor Jodi Rell arrived on the scene to survey the damage from the storm. "It looks like Godzilla went through and ripped roofs off and threw cars around and tore wires down," Finch said as he spoke with reporters and residents who had gathered in the streets. "I mean, it's really amazing," he added. Shelley sent two photos of the damage on East Main Street.

Bethany sent the following photo of downtown Bridgeport.

Personally, my family and I ran to the basement that afternoon once we heard a Tornado Warning was issued and the skies darkened. In a matter of minutes, the wind began to howl and heavy rain fell. My sons were worried that a tornado would rip apart our home. Not unexpectedly, the power went out, but the storm exited shortly thereafter. We didn't get our electricity back until just before midnight. Here's one more photo taken by Amanda of minor flooding on James Street in Bridgeport.

Paul

Venus and Jupiter Prepare for Close Meeting June 30

Paul