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英仙座流星雨
年度三大流星群之一的英仙座流星雨，發生日期一般在7月17日至8月24日之間；今年極大期預估發生在8月13日凌晨1:30～4:00，另有流星雨專家預測在8月12日17:00會有一波額外的高峰期，是母彗星在1610年遺留下的流星體團塊而造成的。
通常在天空晴朗無雲、無光害且輻射點在天頂的最佳狀況下，英仙座流星雨的ZHR值每小時最多可達100顆左右；2008年的觀測資料即達ZHR～116顆。但由於今年極大期時逢月齡22的虧凸月，月亮幾乎與英仙座流星雨輻射點一起在8月12日22：00左右升起，因此受強烈月光的影響，即使在空氣乾淨少污染的高山環境下，肉眼可見流星數量也將僅剩每小時10-20顆左右，觀測條件不若去年好。
英仙座流星雨的母彗星是週期彗星109P/Swift-Tuttle（史威福-塔托彗星），繞太陽公轉一圈約135年，是所有流星雨中第一個被確認母彗星來源者。英仙座流星雨的流星亮度中等（平均約2等）、速度稍快（每秒59公里），約半數流星有尾跡，顏色多半呈白色。偶爾會出現亮度直逼金星的彩色火流星。
New promotion on Google's homepage touts the ability to read Barack Obama's and John McCain's reading lists via Google Reader. They offer reading lists and blog updates from other politicos and pundits as well.
Also, the homepage sports another unique Google logo with a Chinese Dragon playing ping-pong celebrating the Olympics in Beijing.
Google's Pac-Man Logo celebrates PacMan's 30th Anniversary today.
You can actually play the Pac-Man video game on the logo by clicking your mouse pointer!
This is probably the coolest Google Doodle logo EVAH!
One of my friends in highschool had memorized the PacMan patterns, so he could play for HOURS on end -- he only stopped when he got too tired.
Google is celebrating Josef Frank today with another Google doodle logo today, on the 125th anniversary of his birth.
Josef Frank: (born in Baden bei Wien, Austria on July 15, 1885; died in Stockholm on January 8, 1967) was an Austrian/Swedish architect, engineer and textile designer. He worked with Oskar Strnad and was familiar with the Vienna Circle. During 1933 he relocated to Sweden, where he worked for the Svenskt Tenn design company and produced numerous design items until his death. During 1965 he won the Grand Austrian State Prize for architecture.
Google's logo today commemorates the Birthday of author H.G. Wells, who would have been 143 today.
H.G. Wells wrote a Science Fiction classic, "War of the Worlds", a story about alien invaders from Mars. He later performed a dramatic enactment of the invasion in a radio show in America which announced that Grover Mills, New Jersey, had been invaded by aliens. The hoax show was infamous and famous and has entered into legend.
Google has been leading up to this logo in a series of UFO logos which systematically abducted various letters from the logo. They also used their Twitter account to mention clues related to the joke.
For additional info, view my other screengrabs of Google's UFO logos and read Google's blog entry about it all, A Mysterious Series for H.G. Wells.
Google logos (587 versions, 1998-2009) clustered by design features.
Image processing: NERSC. Visualization: Software Studies Initiative, UCSD.
This version uses transparency setting to overlay images.
The Google Israel logo today is celebrating the Tu Bishvat (פרוייקט ההר הירוק) holiday -- "New Year of the Trees".
I find it interesting that the Google name in the illustration is written out in "Earth Art" or "Crop Art", a variation of Environmental Art which can mostly be seen from airplanes, aerial photos, and satellite images.
Read more about Google's Earth Art Logo.
Google's funny logo sporting Big Bird's legs as elles -- this Google doodle logo is commemorating Sesame Street's 40th Birthday today.
Google Crop Circles Logo - Google is displaying another special logo today, linked to search for "crop circles".
This comes just a few days after Google's "unexplained phenomenon" logo with a UFO sucking away one of the "O"s in Google's name.
The Google Logo commemorating the 205th birthday of Hans Christian Andersen.
Andersen was the author of a great many fairy tales (faerie tales), documenting folk tales that were widely distributed throughout Europe.
The small, arrow-like symbol in the lower righthand corner is a navigational tool allowing one to view multiple alternative logos commemorating Hans Christian Andersen.
International homepages for Google are sporting the Mary Shelley logo today, celebrating her 213th birthday.
Mary Shelley was the author of "Frankenstein; or, The Modern Prometheus" - which subsequently spawned generations of novels and movies immitating the story. The warning of the story of a scientist who creates something he cannot control particularly resounds today, with our rapid, paradigm-changing developments happening every other week or so!
Google's Mary Shelley logo can be seen at their international version sites such as: www.google.co.uk