Minggu, 08 April 2012
Sabtu, 07 April 2012
Jumat, 06 April 2012
What is a FULL MOON?
Understanding The Moon Phases
Have you ever wondered what causes the moon phases? We all know that its appearance changes over time. But why? The good way to understand the phases of the moon is to examine an earth-moon-sun diagram:
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All Rights Reserved. This moon phases diagram is NOT public domain and
may not be used on websites, copied, printed or republished except by
permission.
Diagram Explanation
The illustration may look a little complex at first, but it's easy to explain.Sunlight is shown coming in from the right. The earth, of course, is at the center of the diagram. The moon is shown at 8 key stages during its revolution around the earth. The moon phase name is shown alongside the image. The dotted line from the earth to the moon represents your line of sight when looking at the moon. To help you visualize how the moon would appear at that point in the cycle, you can look at the larger moon image. This means for the waning gibbous, third quarter, and waning crescent phases you have to mentally turn yourself upside down. When you do this, you'll "see" that the illuminated portion is on your left, just as you see in the large image.
One important thing to notice is that exactly one half of the moon is always illuminated by the sun. Of course that is perfectly logical, but you need to visualize it in order to understand the phases. At certain times we see both the sunlit portion and the shadowed portion -- and that creates the various moon phase shapes we are all familiar with. Also note that the shadowed part of the moon is invisible to the naked eye; in the diagram above, it is only shown for clarification purposes.
So the basic explanation is that the lunar phases are created by changing angles (relative positions) of the earth, the moon and the sun, as the moon orbits the earth.
If you'd like to examine the phases of the moon more closely, via computer software, you may be interested in this moon phases calendar software.
Moon Phases Simplified
It's probably easiest to understand the moon cycle in this order: new moon and full moon, first quarter and third quarter, and the phases in between.
As shown in the above diagram, the new moon occurs when the moon is positioned between
the earth and sun. The three objects are in approximate alignment (why
"approximate" is explained below). The entire illuminated portion of the
moon is on the back side of the moon, the half that we cannot see.
At a full moon, the earth, moon, and sun are in approximate alignment, just as the new moon, but the moon is on the opposite side of the earth, so the entire sunlit part of the moon is facing us. The shadowed portion is entirely hidden from view.
The first quarter and third quarter moons (both often called a "half moon"), happen when the moon is at a 90 degree angle with respect to the earth and sun. So we are seeing exactly half of the moon illuminated and half in shadow.
Once you understand those four key moon phases, the phases between should be fairly easy to visualize, as the illuminated portion gradually transitions between them.
An easy way to remember and understand those "between" lunar phase names is by breaking out and defining 4 words: crescent, gibbous, waxing, and waning. The word crescent refers to the phases where the moon is less that half illuminated. The word gibbous refers to phases where the moon is more than half illuminated. Waxing essentially means "growing" or expanding in illumination, and waning means "shrinking" or decreasing in illumination.
Thus you can simply combine the two words to create the phase name, as follows:
After the new moon, the sunlit portion is increasing, but less than half, so it is waxing crescent. After the first quarter, the sunlit portion is still increasing, but now it is more than half, so it is waxing gibbous. After the full moon (maximum illumination), the light continually decreases. So the waning gibbous phase occurs next. Following the third quarter is the waning crescent, which wanes until the light is completely gone -- a new moon.
The Moon's Orbit
You may have personally observed that the moon goes through a complete moon phases cycle in about one month. That's true, but it's not exactly one month. The synodic period or lunation is exactly 29.5305882 days. It's the time required for the moon to move to the same position (same phase) as seen by an observer on earth. If you were to view the moon cycling the earth from outside our solar system (the viewpoint of the stars), the time required is 27.3217 days, roughly two days less. This figure is called the sidereal period or orbital period. Why is the synodic period different from the sidereal period? The short answer is because on earth, we are viewing the moon from a moving platform: during the moon cycle, the earth has moved approximately one month along its year-long orbit around the sun, altering our angle of view with respect to the moon, and thus altering the phase. The earth's orbital direction is such that it lengthens the period for earthbound observers.Although the synodic and sidereal periods are exact numbers, the moon phase can't be precisely calculated by simple division of days because the moon's motion (orbital speed and position) is affected and perturbed by various forces of different strengths. Hence, complex equations are used to determine the exact position and phase of the moon at any given point in time.
Also, looking at the diagram (and imagining it to scale), you may have wondered why, at a new moon, the moon doesn't block the sun, and at a full moon, why the earth doesn't block sunlight from reaching the moon. The reason is because the moon's orbit about the earth is about 5 degrees off from the earth-sun orbital plane.
However, at special times during the year, the earth, moon, and sun do in fact "line up". When the moon blocks the sun or a part of it, it's called a solar eclipse, and it can only happen during the new moon phase. When the earth casts a shadow on the moon, it's called a lunar eclipse, and can only happen during the full moon phase. Roughly 4 to 7 eclipses happen in any given year, but most of them minor or "partial" eclipses. Major lunar or solar eclipses are relatively uncommon.
Moon Software
If you want to follow the phases of the moon, you should definitely take a look at QuickPhase Pro, our flagship moon software product for your personal computer. This attractive and fun software covers thousands of years of past and future moon phases and is easy to use.Senin, 02 April 2012
Minggu, 01 April 2012
Kamis, 29 Maret 2012
Spongebob Profile
| Jenis Kelamin: | Laki-Laki |
|---|---|
| Warna: | Kuning |
| Warna mata: | Biru |
| Tanggal lahir: | 14 Juli 1986 (umur 25 tahun) |
| Tinggi badan: | 4 inci |
| Berat badan: | 2 oz |
| Hobi : | Bermain dengan Patrick, menggangu Squidward, berburu ubur-ubur di Ladang Ubur-Ubur, bermain gelembung, Karate, dan bekerja di Krusty Krab. |
| Pekerjaan : | Koki Krusty Krab |
|---|
Badai Salju Di Indonesia
REPUBLIKA.CO.ID, PADANG---Meski termasuk negara tropis,
ternyata Indonesia pun bisa mengalami badai salju. Tidak percaya?
Itulah yang terjadi ketika puluhan rumah warga mengalami kerusakan
akibat dihantam badai salju yang melanda Kabupaten Sijunjung, Sumatera
Barat (Sumbar). "Badai salju melanda Kabupaten Sijunjung pada Rabu
(28/3) sekitar pukul 20.00 WIB mengakibatkan puluhan rumah mengalami
kerusakan, "kata Kabid Penanggulangan Bencana BPBD Sumbar Ade Edwar di
Padang, Kamis (29/3).Dia menambahkan, badai salju yang melanda Kabupaten Sijunjung itu tidak menimbulkan korban jiwa, hanya mengalami kerugian materil. "BPBD masih melakukan penghitungan berapa kerugian harta benda ketika badai salju itu,"katanya.
Dia mengatakan, badai salju yang melanda Kabupaten Sijunjung hingga merusak puluhan rumah tersebut merupakan yang pertama kali terjadi di Sumbar. "Badai salju ini tidak pernah terjadi, ini merupakan pertama kali terjadi di Sumbar,"katanya.
Menurutnya, warga yang rumahnya mengalami kerusakan akibat dihantam badai salju telah dievakuasi ke tempat yang dirasakan aman. "BPBD telah mendirikan berapa unit tenda darurat bagi warga yang mengungsi, sementara itu bantuan akan segera dikirimkan,"katanya.
Dia menambahkan, untuk sementara aktivitas warga yang berada di Kabupaten Sijunjung masih belum pulih akibat badai salju yang melanda. "Masyarakat Kabupaten Sinjunjung masih merasakan khawatir jika badai salju susulan kembali terjadi, mereka berharap pemeerintah cepat memberikan bantuan,"katanya.
sumber : http://id.yahoo.com/
Rabu, 28 Maret 2012
Nothing's Gonna Change My Love For You Lyrics
George Benson-Nothing's Gonna Change My Love For You
If I had to live my life without you near me
The days would all be empty
The nights would seem so long
With you I see forever oh, so clearly
I might have been in love before
But it never felt this strong
Our dreams are young and we both know
They’ll take us where we want to go
Hold me now, touch me now
I don’t want to live without you.
Nothing’s gonna change my love for you
You oughta know by now how much I love you
One thing you can be sure of
I’ll never ask for more than your love.
Nothing’s gonna change my love for you
You ought to know by now how much I love you
The world may change my whole life through but nothing’s gonna change my
love for you.
If the road ahead is not so easy
Our love will lead the way for us like a guiding star
I’ll be there for you if you should need me
You don’t have to change a thing
I love you just the way you are.
So come with me and share this view
I’ll help you see forever too
Hold me now, touch me now
I don’t want to live without you.
If I had to live my life without you near me
The days would all be empty
The nights would seem so long
With you I see forever oh, so clearly
I might have been in love before
But it never felt this strong
Our dreams are young and we both know
They’ll take us where we want to go
Hold me now, touch me now
I don’t want to live without you.
Nothing’s gonna change my love for you
You oughta know by now how much I love you
One thing you can be sure of
I’ll never ask for more than your love.
Nothing’s gonna change my love for you
You ought to know by now how much I love you
The world may change my whole life through but nothing’s gonna change my
love for you.
If the road ahead is not so easy
Our love will lead the way for us like a guiding star
I’ll be there for you if you should need me
You don’t have to change a thing
I love you just the way you are.
So come with me and share this view
I’ll help you see forever too
Hold me now, touch me now
I don’t want to live without you.
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