Jakarta bisa melihat GMC nya pak Franc. Silahkan tengok di dongengan saya. Juga ada petunjuk utk melihatnya.
Salam Rovicky.wordpress.com On 1/24/09, Franciscus B Sinartio <[email protected]> wrote: > Ini artikel yang lebih panjang. > hati2 jangan melihat ke gerhananya secara > langsung, walaupun tidak kerasa apa2 ke mata. > menurut artikel ini, Jakarta tidak akan melihatnya. > > fbs > > Solar Eclipse to Cause 'Counterfeit Twilight' > > > By Joe Rao > SPACE.com Skywatching Columnist > posted: 23 January 2009 > 09:19 am ET > > > If > you plan to be anywhere from the southern third of Africa, to southern and > eastern India, southeastern China, Southeast Asia, and virtually all of > Australia on Monday, January 26, you will be treated to a view of a solar > eclipse. > This will be an annular > or ring eclipse of the sun, so called because the moon's disk will appear > too small to completely cover the sun's disk. This circumstance is due to > the > fact that the moon will be a bit farther from Earth than average. > An annular eclipse, though > a rare and amazing sight, is far different from a total > solar eclipse. Since the sun's brilliant surface or photosphere never > completely disappears, the panoply of striking phenomena seen during a total > eclipse such as the corona and prominences and the dramatic darkening of the > sky accompanied by some of the brighter stars and planets, will not be > seen. > Rather, at maximum, > skywatchers will see a "penny atop a nickel" effect, with the sun > mimicking a blazing ring of light rimming the dark silhouette of the moon > (creating the so-called "annulus" or ring effect). Put another > way, the dark cone of the moon's shadow, called the umbra, will not be long > enough to reach the Earth. So, anybody who is standing on the patch of > Earth to which the umbra points sees up all around it – a ring, or annulus > of sunlight surrounding the dark > moon. > A strange "counterfeit > twilight" falls over the landscape, but it falls far short of even a > miniature night; in essence, this is really nothing more than a very fancy > partial > eclipse. > Where it's visible > The moon's faint outer shadow > or penumbra first touches Earth at dawn in the South Atlantic Ocean about > 500 mi. (800 km.) off the South African coast. A bit over an hour later, > the central axis of the shadow – the so-called "antumbra" – arrives, > in the South Atlantic about 1,600 mi. (2,600 km.) west of southern Namibia, > Africa. > From here, the path of the > annular eclipse curves east-southeast, completely missing southernmost > Africa. As seen from Cape Agulhas, the geographic southern tip of the > African continent, the > moon will appear to cover 74 percent of the sun's diameter as the antumbra > passes a few hundred miles to the south. > Unfortunately, virtually > the entire annularity track falls over open waters, sliding first over the > South Atlantic, and then tracking east, then northeast over the Indian > Ocean. The eclipse reaches its maximum at > local apparent noon, pretty much over the middle of the Indian Ocean. A > shipboard observer would see the moon's dark > outline wholly inside the sun for 7 minutes and 54 seconds, changing the sun > into a "ring of > fire." > The first landfall by the > antumbra finally comes in the late afternoon about half way from Australia > to Sri Lanka over the Cocos Iand Keeling Islands, which belong > to Australia and are thickly covered with coconut palms and other > vegetation. > As the path of annularity > approaches its end, it sweeps northeast through Indonesia, and in the > process > crosses over portions of Sumatra, Java, Borneo, Malaysia and Sulawesi, > before > finally coming to its end at local sunset over the Celebes Sea. Yet, the > antumbra somehow manages to avoid all of the major population centers in > this > part of the world. Its northern limit will slide just to the southeast of > Palembang (Sumatra) and its southern limit will even more narrowly miss > Jakarta > (Java), which currently is the eleventh largest city, fifth largest > metropolitan area and ninth most densely populated city in the world. > Taking a brief jog across the Java Sea, the shadow crosses over into Borneo, > the > southern limit of the antumbra passing just to the north and west of > Balikpapan and its > 500,000 inhabitants. > For all of these cities, at > maximum eclipse, the sun will not appear as a ring; rather it will mimic a > horseshoe with pointed tips. > Outside the path of > annularity, a partial eclipse will be visible. The closer you are to the > annular track, the larger the "bite" that the passing moon will > appear to take out of the sun. In Australia, the eclipse falls on > Australia Day; a National holiday. Much of that country (except Tasmania) > will get a > glimpse of the eclipse coinciding (or nearly so) with local sunset. > A listing of local > circumstances for selected locations within the eclipse zone can be found > here. > Be careful! > To look at the sun without > proper eye protection is dangerous. Even if you are in the path of the > annular eclipse you will need to protect your eyes. > By far, the > safest wayto view a solar eclipse is to construct a "pinhole camera." > A pinhole or small opening is used to form an image of the sun on a screen > placed about three feet behind the opening. Binoculars or a small > telescope mounted on a tripod can also be used to project a magnified image > of > the sun onto a white card. Just be sure not to look through the > binoculars or telescope when they are pointed toward the sun! > A variation on the pinhole > theme is the "pinhole mirror." Cover a pocket-mirror with a > piece of paper that has a quarter-inch hole punched in it. Open a > sun-facing window and place the covered mirror on the sunlit sill so it > reflects a disk of light onto the far wall inside. The disk of light is > an image of the sun's face. The farther away from the wall is the better; > the image will be only one inch across for every 9 feet from the mirror. Of > course, don't let anyone look at the sun in the mirror. > Acceptable filtersfor unaided visual solar > observations include aluminized Mylar. Some astronomy dealers carry Mylar > filter material specially designed for solar observing. Also acceptable is > shade 14 arc-welder's glass, available for just a few of dollars at welding > supply shops. > Unacceptable > filtersinclude sunglasses, color film negatives, black-and-white film that > contains no > silver, photographic neutral-density filters, and polarizing filters. > Although these materials have very low visible-light transmittance levels, > they > transmit an unacceptably high level of near-infrared radiation that can > cause a > thermal retinal burn. The fact that the sun appears dim, or that you feel > no discomfort when looking at the sun through the filter, is no guarantee > that > your eyes are safe. > Later this year . . > . > On July 22, the longest > total solar eclipse in the 21st century will take place, as the moon's dark > umbral shadow races across central India, the People's Republic of China > (including Shanghai), and some of the Ryukyu Islands of Japan. At the > point of greatest eclipse, totality will last 6 minutes 39 seconds; the > longest > of any eclipse between 1991 and 2132; it is an eclipse that is eagerly being > awaited by millions who live along the path of totality and countless > thousands > more from around the world who plan to position themselves within the path. > > -------------------------------------------------------------------------------- > serah-terima pp-iagi: senin sore, 13 oktober 2008 > ketua umum: LAMBOK HUTASOIT > sekjen: MOHAMMAD SYAIFUL > pasukan sedang disusun, hanya satu IAGI... > -------------------------------------------------------------------------------- > ayo, segera pula siapkan utk PIT IAGI ke-38 > dg tuan-rumah adalah PENGDA JATENG > * mungkin di semarang > * mungkin pula di solo > * mungkin juga join dg HAGI dll. > ----------------------------------------------------------------------------- > To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id > To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id > Visit IAGI Website: http://iagi.or.id > Pembayaran iuran anggota ditujukan ke: > Bank Mandiri Cab. Wisma Alia Jakarta > No. Rek: 123 0085005314 > Atas nama: Ikatan Ahli Geologi Indonesia (IAGI) > Bank BCA KCP. Manara Mulia > No. Rekening: 255-1088580 > A/n: Shinta Damayanti > IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ > IAGI-net Archive 2: http://groups.yahoo.com/group/iagi > --------------------------------------------------------------------- > DISCLAIMER: IAGI disclaims all warranties with regard to information posted > on its mailing lists, whether posted by IAGI or others. In no event shall > IAGI and its members be liable for any, including but not limited to direct > or indirect damages, or damages of any kind whatsoever, resulting from loss > of use, data or profits, arising out of or in connection with the use of any > information posted on IAGI mailing list. > --------------------------------------------------------------------- > > -- Sent from my mobile device "Kekerasan atas nama negara lebih nyata ketimbang kekerasan atas nama agama !" -------------------------------------------------------------------------------- serah-terima pp-iagi: senin sore, 13 oktober 2008 ketua umum: LAMBOK HUTASOIT sekjen: MOHAMMAD SYAIFUL pasukan sedang disusun, hanya satu IAGI... -------------------------------------------------------------------------------- ayo, segera pula siapkan utk PIT IAGI ke-38 dg tuan-rumah adalah PENGDA JATENG * mungkin di semarang * mungkin pula di solo * mungkin juga join dg HAGI dll. ----------------------------------------------------------------------------- To unsubscribe, send email to: iagi-net-unsubscribe[at]iagi.or.id To subscribe, send email to: iagi-net-subscribe[at]iagi.or.id Visit IAGI Website: http://iagi.or.id Pembayaran iuran anggota ditujukan ke: Bank Mandiri Cab. Wisma Alia Jakarta No. Rek: 123 0085005314 Atas nama: Ikatan Ahli Geologi Indonesia (IAGI) Bank BCA KCP. Manara Mulia No. Rekening: 255-1088580 A/n: Shinta Damayanti IAGI-net Archive 1: http://www.mail-archive.com/iagi-net%40iagi.or.id/ IAGI-net Archive 2: http://groups.yahoo.com/group/iagi --------------------------------------------------------------------- DISCLAIMER: IAGI disclaims all warranties with regard to information posted on its mailing lists, whether posted by IAGI or others. In no event shall IAGI and its members be liable for any, including but not limited to direct or indirect damages, or damages of any kind whatsoever, resulting from loss of use, data or profits, arising out of or in connection with the use of any information posted on IAGI mailing list. ---------------------------------------------------------------------
