And that inverted Bowl they call the Sky, Whereunder crawling coop'd we live and die, Lift not your hands to It for help — for It As impotently moves as you or I
Omar Khayyam; 18 May 1048 – 4 December 1131
The Jalali calendar was introduced by Omar Khayyam alongside other mathematicians and astronomers in Nishapur.
The Jalālī calendar was a true solar calendar where the duration of each month is equal to the time of the passage of the Sun across the corresponding sign of the Zodiac.
The calendar reform introduced a unique 33-year intercalation cycle.based on quadrennial and quinquennial leap years. Therefore, the calendar consisted of 25 ordinary years that included 365 days, and 8 leap years that included 366 days,
The calendar remained in use across Greater Iran from the 11th to the 20th centuries. In 1925 this calendar was simplified and the names of the months were modernized, resulting in the modern Iranian calendar.
The Jalali calendar is more accurate than the Gregorian calendar of 1582 with an error of one day accumulating over 5,000 years, compared to one day every 3,330 years in the Gregorian calendar:
Moritz Cantor considered it the most perfect calendar ever devised.
Omar was unusual for his time as he was an astronomer with no real belief in astrology (even though that was his job, including weather prediction)
Other birthdays from the week include the 100th Birthday of Richard Feynman May 11, 1918 – February 15, 1988)
Near the end of his life he was one of those tasked on the Presidential Rogers Commission, which investigated the Challenger disaster. During a televised hearing, Feynman demonstrated that the material used in the shuttle's O-rings became less resilient in cold weather by compressing a sample of the material in a clamp and immersing it in ice-cold water
Feynman devoted the latter half of his book What Do You Care What Other People Think? Feynman's account reveals a disconnect between NASA's engineers and executives of NASA's high-ranking managers he revealed startling misunderstandings of elementary concepts. NASA managers claimed that there was a 1 in 100,000 chance of a catastrophic failure aboard the shuttle, engineers estimated the chance of a catastrophe at closer to 1 in 200, he was particularly angered that NASA used it to recruit Christa McAuliffe into the Teacher-in-Space program.
He warned in his appendix to the commission's report (which was included only after he threatened not to sign the report), "For a successful technology, reality must take precedence over public relations, for nature cannot be fooled."
SpaceX Block 5
8 years and 51 flights of developing the Falcon 9 rocket, SpaceX has taken all of the lessons it has learned into Block 5 variant of the booster that flew it’s maiden voyage last Friday.
Musk said that after crazy hard Block 5 development process he is convinced that rockets can be flown, landed, and flown again within 24 hours
changes focus on increased safety for crewed flights with its Dragon spacecraft. “NASA’s human rating requirements,They are quite extensive.”
NASA has said it needs to see seven flights of the Block 5 version of the rocket before it is confident in the new configuration
7,600Kn of thrust. So listener what is the Gigawatts of this engine?
“Ironically, we need to take it apart to confirm it does not need to be taken apart.” so a few months before a relaunch
However, by the end of this year, he expects at least one of the new rockets to have flown three or even four times. By the end of 2019, Musk anticipates that a Block 5 rocket probably will have reached 10 flights.
2019 SpaceX plans to launch a Block 5 booster and then refly it again within 24 hours. “Literally no actions taken, just like an aircraft,” Musk said.
SpaceX will probably build about 30 to 50 Block 5 rockets, About 300 missions over its lifetime,
Musk expects the Big Falcon Rocket now under development to supersede the smaller booster.
SpaceX also continues trying to reuse the second stage of the Falcon 9,
SpaceX could theoretically get Falcon 9 launch to about 10 percent of the $62 million.
Musk noted that the company will need to recover the development costs for reusable rockets, Big Falcon Rocket development and the Starlink Internet satellite program
NASA set a new distance record for CubeSats on May 8 when a pair of CubeSats called Mars Cube One (MarCO) reached 621,371 miles (1 million kilometers) from Earth. MarCO-B took its first photo on May 9 that captured Earth and its moon as tiny specks floating in space.
India Space News
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The Brexit row between the UK and the EU-27 over Galileo is escalating