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"Ye stars! Which are the poetry of heaven!" - Lord Byron (1788-1824)
"To see the world in a grain of sand, Visit the Sandburg Sky Poetry Web page, including CSMS student-authored sky poems. |
A Fairfax County Public Schools Planetarium '00-01 Special Events | '99-00 Special Events | '98-99 Special Events
Special Events for 2001-2002(Events sorted in reverse chronological order, ending SEP 2001.)
The Dog Days of Summer
Sirius is much like a Greek word meaning "scorcher." The "Dog Days of Summer" refers to the time period during the summer when Sirius--the brightest star in the night sky--is high in the daytime sky, supposedly adding to the heat of the summer Sun (Sirius is searing us).
Safe Solar Observing
Earth at Aphelion
Earliest Sunrise/Latest Sunset
The Summer Solstice occurs at 9:24 a.m. EDT on 21 June
2002. On this date, the Sun reaches the northernmost line of latitude
(the Tropic of Cancer, 23.5°N) where the midday Sun is at the
zenith (the imaginary point directly overhead). At northern mid-latitude
locations, the midday Sun reaches its maximum altitude (annually) and the
duration of insolation (number of hours of daylight) is greatest. For
example, in Washington, D.C. the midday Sun will reach an altitude of 74.5
degrees above the horizon and there will be nearly 15 hours of daylight
(14h54m). Also, the Sun rises farthest to the north of east (to the far
left of the Washington Monument in the accompanying photograph) and sets
farthest to the north of west than at any other time of year.
It's interesting to note that the apparent paths of the Sun and Moon across the sky are exactly opposite at the solstices: near the time of the June Solstice, the Full Moon follows the path of the Sun during the December Solstice; near the time of the December Solstice, the Full Moon follows the path of the Sun during the June Solstice. For more information, see Yin and Yang - Dynamic Equilibrium in the Universe.
By jimminy, it's time to say, "Bye, Gemini!"
National Hurricane Awareness Week The National Weather Service has declared
May 19-25, 2002 as National Hurricane Awareness Week. Each
day of the week will have a special emphasis:
"The goal of Hurricane Awareness Week is to educate you about the hazards of Hurricanes and provide you with knowledge which can be used to help protect you, your family, and your property." [Quote courtesy the NOAA/NWS Tropical Prediction Center (TPC), formerly known as the National Hurricane Center (NHC).]
Sandburg Sun-Earth-Moon Day 2002Editor's Note: Good friends and good conditions combined for a great day for firsthand observation of the real sky: fair weather prevailed for most of the day (relatively clear skies and comfortable temperatures); and the daily sunspot number was high (317). In a word, S-E-M Day 2002 was another smashing success! For details, read Sandburg "Sun-Earth-Moon Day 2002" - a special report highlighting Sandburg Planetarium's local celebration of Space Day.
Astronomy Day at Huntley Meadows Park
rescheduled for Sunday, 28 April, 3-9 p.m.
Two formal workshops (reservations required) will be held at the Huntley Meadows Park Visitor Center: Rain Date: Sunday, 28 April 2002 [Astronomy Day@HMP is part of the program, "Bringing Astronomy to the People"--the Sandburg Planetarium public outreach initiative for 2001-2002.] Editor's Note: During a three-hour window of opportunity between morning and evening rain events, approximately 50-70 people participated in AD@HMP. See photographs of the special event as well as the park, courtesy Phil Wherry.
A Gathering of Planets
First 90-Degree Day
Spring Forward... At 2:00 a.m. on
Sunday, 07 April 2002 set your clocks forward one hour to begin "Daylight
Saving Time" (EDT). Something of a misnomer, we merely shift the
increasing daylight hours from morning to evening. Daylight Saving Time
begins on the first Sunday in April (spring forward...) and ends on the
last Sunday in October (...fall back).
April is National Poetry Month
Comet Ikeya-Zhang A simple comet-watching mnemonic: I C IC C I-Z? (I see
icy Comet Ikeya-Zhang?) Maybe. "A newly discovered comet, now approaching
the Sun and Earth, could develop into a relatively bright naked-eye object
in coming weeks, researchers say. The best views of the comet may be
reserved for those under dark skies far from bright lights, but even city
dwellers should be able to spot it. ... Ikeya-Zhang's expected path across
the sky in the coming weeks will greatly favor Northern Hemisphere
observers. During most of March on into early April, the comet will
be visible near to the north-northwest horizon about an hour after
sundown. Bright moonlight may hinder observations during the last week of
March." [Source: Comet makes its
celestial entrance, courtesy MSNBC.]
As of 15 February, Ikeya-Zhang's apparent magnitude was +6.8m. For reference, +6.0 is the naked-eye limit at a dark site; +9.0 is the limiting magnitude of 50mm binoculars. Comet Ikeya-Zhang is expected to peak somewhere between +3.5 and +3.0. "The 1986 appearance of Halley's Comet, considered disappointing by many, also peaked at around magnitude 3.0. In contrast, Comet Hale-Bopp, which put on a memorable show in April 1997, attained a brightness close to magnitude -1, or about 60 times brighter than Halley." [Source: ibidem, MSNBC] For more information (including graphics showing where to look in the sky for the comet), read Comet Ikeya-Zhang (updated 01 MAR '02), an article featured at Sky & Telescope online. Ikeya-Zhang Updates: The March Equinox occurs at 19:16 UTC (2:16 p.m. EST) on
20 March 2002. The word equinox literally means "equal nights,"
referring to either of two times of the year when the Sun crosses the
plane of the Earth's Equator and day and night are of nearly equal length,
that is, about March 21 and September 21. The Sun rises exactly due east
(just to the right of the Washington Monument in the accompanying
photograph) and sets due west. The March Equinox is the beginning of
astronomical spring in the Northern Hemisphere and autumn in the Southern
Hemisphere (in the Northern Hemisphere, meteorological spring is
MAR, APR, and MAY).
Celebrate the Equinox and the Seasons by participating in a local observance of NASA Sun-Earth Day, Wednesday, 20 March 2002. [Teachers: See the SCSA/Themes/Sun-Earth Connection Web page for theme-related information resources and suggested teaching strategies.] Sundials & Equinoxes: Theoretically, the gnomon (or style) of a properly oriented equatorial sundial will not cast a shadow on the dial plate during the equinoxes. Because the dial plate of an equatorial sundial is parallel to the Earth's Equator, the Sun is directly over the edge of the dial plate on the equinoxes, when the Sun is at the zenith along the Equator. From the March Equinox to the September Equinox, when the Sun is at the zenith in the Northern Hemisphere (between 0° and 23.5°N lat.), the gnomon shadow falls on the upper dial face; from the September Equinox to the March Equinox, when the Sun is at the zenith in the Southern Hemisphere (between 0° and 23.5°S lat.), the gnomon shadow falls on the lower dial face.
March: In Like a Lion; Out Like a Lamb.
Perigee & the Full Moon; the Moon Illusion
27
February 2002, the closest perigee of the year coincides with the Full
Moon (see the Lunar Perigee and
Apogee Calculator). Huh? The Moon's orbit
around the Earth is an ellipse
(not a perfect circle), therefore the Earth-Moon distance varies: perigee
is when the Moon is closest to the Earth; apogee
is when the Moon is farthest. Does the Earth-Moon distance vary enough to
affect the apparent size of the Moon? In a word, yes (see Inconstant Moon
- The Moon at Perigee and Apogee or Big
Moonshine), although the difference may be imperceptible to all but
the most careful observers.Read about the "Moon Illusion," an unrelated phenomenon wherein some people perceive that the Moon appears to be larger when it is near the horizon than when it is higher in the sky:
Moon Occults Saturn
18 February 2002 - Pluto Anniversary
02 February 2002 - Groundhog Day
Editor's Note: Punxsutawney Phil saw his shadow, and we know what that means.... Sigh!
Cold Facts to Warm Your Heart!
Latest Sunrise/Earliest Sunset
The Sun reaches the December Solstice at 19:21 UTC
(02:21 p.m.) on 21 DEC 2001, marking the beginning of
astronomical winter in the Northern Hemisphere and summer in the Southern
Hemisphere (in the Northern Hemisphere, meteorological winter is
DEC, JAN, and FEB). On this date, the Sun reaches the southernmost line of
latitude (the Tropic of Capricorn, 23.5°S) where the midday Sun is at
the zenith (the imaginary point directly overhead). At northern
mid-latitude locations, the midday Sun reaches its minimum altitude
(annually) and the duration of insolation (number of hours of daylight) is
least. For example, in Washington, D.C. the midday Sun will reach an
altitude of 26.5 degrees above the horizon and there will be 9h26m of daylight. Also, the Sun rises farthest south of east (to the
far right of the Washington Monument in the accompanying photograph) and
sets farthest south of west than at any other time of year.
It's interesting to note that the apparent paths of the Sun and Moon across the sky are exactly opposite at the solstices: near the time of the December Solstice, the Full Moon follows the path of the Sun during the June Solstice; near the time of the June Solstice, the Full Moon follows the path of the Sun during the December Solstice. For more information, see Yin and Yang - Dynamic Equilibrium in the Universe.
December's Gems/Boardwalk Astronomy
The Geminid meteor shower peaks on the night/morning of December
13/14. Under ideal conditions, as many as 120 meteors per
hour might be seen. This year, the New Moon will not be a source of light pollution. To find Gemini (the shower
radiant), refer to the December FCPS
Starfinder which shows the 9 p.m. mid-December sky; Gemini is
constellation No. 3, rising above the eastern horizon [to the upper-left
of Orion, the Hunter (No. 1)]. For more information, visit SKY Online's
Meteor Page.
Weather permitting, join the Sandburg Planetarium Teacher, volunteers from the Northern Virginia Astronomy Club, and Fairfax County Park Authority Naturalists for an informal night of meteor- and skywatching at Huntley Meadows Park. Binoculars and telescopes will be available for public observation. Dress warmly! Bring a blanket &/or a lawn chair. Plan to meet at the Visitor Center around 9-ish on 13 DEC; as a group, we will venture out to the boardwalk/wetland trail in the middle of the park. For more information or to make reservations (required), contact Kitty Keller, FCPA Naturalist, at 703-768-2525. [Part of the program, "Bringing Astronomy to the People"--the Sandburg Planetarium public outreach initiative for 2001-2002.] Editor's Note: More than 70 people registered to particpate in the "Boardwalk Astronomy" event (many more folks were wait-listed); regrettably the event was cancelled due to inclement weather. Thanks for your interest!
Earliest Sunset/Latest Sunrise
Hurricane Season Ends
Once in a Blue Moon During November
2001, there are two Full Moons: the first Full Moon occurs on NOV 1; the
second Full Moon is on NOV 30. When two Full Moons occur in the same
month, the second is referred to as a Blue Moon. Well, that's the
most widely used modern definition of a Blue Moon. Visit the Blue Moon Folklore
Web page for a comprehensive review of past usage of the term.
On average, Blue Moons occur once every three years (33 mo.). The next Blue Moon occurs in July 2004 (Full Moons on 02 & 31 July). The Blue Moon Web page includes a nice FAQ list, as well as a hyperlink to the Blue Moon Calculator. Music sets the mood! From the audio CD, Classic Doo Wop: Best of The Marcels, listen to Track 1, Blue Moon (2:21).
Leonids Meteor Shower
The annual Leonids
meteor shower should occur on the night/morning of November
17th/18th, peaking on Sunday, 18 NOV around 5 a.m. EST (Washington,
D.C.). Plan to watch anytime after 11 p.m.-to-12 midnight when the
constellation Leo, the Lion rises above the eastern horizon--meteors will
appear radiate outward from Leo. To find Leo, refer to the January FCPS Starfinder (the 9 p.m.
January sky is the same as the 1 a.m. November sky); note the bright star
Regulus, the heart of the lion (Letter "M") rising above the eastern
horizon. For more information, visit The
Sky is Falling!, Astronomy.com's guide to meteors and how to watch
them (also, Heads
up: Here come the Leonids), or visit SKY Online's
Meteor Page.
Next month, December's GEMs (the Geminids meteor shower).... Editor's Note: Under less than ideal conditions (urban light pollution, haze, and toward sunrise, thin fog) between 4 and 6 a.m., Sunday, 18 NOV 2001, I saw dozens of meteors, possibly more than a hundred total. In contrast, a good friend reported that, "Conditions were very, very good on Skyline Drive; we easily saw thousands [of meteors] over a period of maybe three hours. There were times when four or five were visible at once, though it was more typical to see one every second or two." Incredible!
Beginning of Ramadan - 17 November 2001
"The Islamic calendar is based on lunar months, which begin when the thin
Crescent Moon is actually sighted in the western sky after sunset within a
day or so after New Moon." Ramadan is the name for one of
the 12 months of the Islamic calendar. The New Moon occurs on 15 November
2001; the first day of Ramadan is 17 November 2001. "The Islamic
date begins at sunset on the previous evening [16 NOV] and ends at sunset
on the [17th]." For details, see the U.S. Naval Observatory article, Crescent Moon
Visibility and the Islamic Calendar (source of preceding quotes).
Halloween - 31 OctoberThe name All Hallows E'en means "hallowed" or "holy evening," the eve before All Saints' Day. Before that it was an old Druid festival that began at midnight and lasted throughout the following day. The festival was in honor of Crone Hecate the Destroyer who brought death to all vegetation, returning the seed of life to sleep [a simple explanation for the change of seasons from summer to fall to winter]. To honor Pomona, the goddess of fruits and seed, people shared apples and nuts.
Daylight Saving Time Ends Remember the mnemonic: Spring forward; fall
back? On the last Sunday in October (2 a.m., Sunday,
28 October 2001), clocks are set back one hour to return to
Standard Time. Notice how much earlier sunset seems to be! Sure sign that
winter is coming: the number of daylight hours is decreasing. By the time
of the December Solstice (21 DEC 2001), there will be only nine
hours and 27 minutes (9h27m) of daylight--the fewest hours of daylight all
year!
First Frost
A few frosty facts for Washington, D.C. (Reagan National Airport): With the onset of frosty cold temperatures, it won't be long 'til the first snowfall! In the meantime, make artificial snow by visiting Snowflake Designer, a very cool (pun intended) Shockwave multimedia Web site.
October Sky
The Harvest Moon usually occurs in September, but occasionally falls in October, as it does this year.
Weather permitting, Monday evening,
24 September 2001 [before the Sandburg MS
Back-to-School Night (BTSN)], join the Sandburg
Planetarium Teacher for a quick guided tour of the evening sky,
featuring real-sky observation of sunspots (before sunset), the First
Quarter Moon, as well as a variety of other night sky targets including
the planet Mars, prominent stars & constellations, etc. Binoculars and
telescopes will be available for public observation. Volunteers from the
Northern Virginia Astronomy Club will be
on-hand to provide guidance and answer questions. Look for us on your way
to the BTSN meeting.Editor's Note: Regrettably, the "Sidewalk Astronomy" event was cancelled due to inclement weather. The equinox occurs on 22 September 2001 at 7:04
p.m. EDT, marking the beginning of astronomical autumn in the Northern
Hemisphere and the start of astronomical spring in the Southern
Hemisphere. The Sun rises exactly due east (just to the right of the
Washington Monument in the accompanying photograph) and sets due west, and
day and night are approximately equal in duration. Note: meteorological
fall (SEP, OCT, NOV) begins 01 SEP.
Sundials & Equinoxes: On the equinoxes, the gnomon of a properly oriented equatorial sundial will not cast a shadow on the dial plate. Because the dial plate of an equatorial sundial is parallel to the Earth's Equator, the Sun is directly over the edge of the dial plate on the equinoxes (when the Sun is at the zenith along the Equator). From the March Equinox to the September Equinox, the gnomon shadow falls on the upper dial face; from the September Equinox to the March Equinox, the gnomon shadow falls on the lower dial face.
NOVAC Star Gaze 2001Editor's Note: I'm pleased to report that it was my good fortune to be able to attend my first NOVAC Star Gaze, but it won't be my last! The event was attended by several hundred NOVAC members--knowledgeable men and women who enthusiatically invited anyone who passed by to have a look at the night sky as seen through a wide variety of binoculars and telescopes. Thanks to everyone who graciously allowed me to use their equipment--good show!
Say Goodbye to the 90s...
Hurricane Season
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