Specific orbital energy

Abu al-Hasan 'Ali ibn 'Abd al-Rahman ibn Ahmad ibn Yunus al-Sadafi al-Misri (Arabic: ابن يونس) (c. 950-1009) was an important Egyptian Muslim astronomer and mathematician, whose works are noted for being ahead of their time, having been based on meticulous calculations and attention to detail.

The crater Ibn Yunus on the Moon is named after him.

Life

Information regarding his early life and education is uncertain. He was born in Egypt between 950 and 952 and came from a respected family in Fustat. His father was a historian, biographer and scholar of hadith, who wrote two volumes about the history of Egypt—one about the Egyptians and one based on traveler commentary on Egypt. A prolific writer, Ibn Yunus' father has been described as "Egypt's most celebrated early historian and first known compiler of a biographical dictionary devoted exclusively to Egyptians". His great grandfather had been an associate of the noted legal scholar Imam Shafi.

Early in the life of Ibn Yunus, the Fatimid dynasty came to power and the new city of Cairo was founded. In Cairo, he worked as an astronomer for the Fatimid dynasty for twenty-six years, first for the Caliph al-Aziz and then for al-Hakim. Ibn Yunus dedicated his most famous astronomical work, al-Zij al-Kabir al-Hakimi, to the latter.

Works

Astrology

In astrology, noted for making predictions and having written the Kitab bulugh al-umniyya ("On the Attainment of Desire"), a work concerning the heliacal risings of Sirius, and on predictions concerning what day of the week the Coptic year will start on.

Astronomy

Ibn Yunus' most famous work in Islamic astronomy, al-Zij al-Kabir al-Hakimi (c. 1000), was a handbook of astronomical tables which contained very accurate observations, many of which may have been obtained with very large astronomical instruments. According to N. M. Swerdlow, the Zij al-Kabir al-Hakimi is "a work of outstanding originality of which just over half survives".

Yunus expressed the solutions in his zij without mathematical symbols, but Delambre noted in his 1819 translation of the Hakemite tables that two of Ibn Yunus' methods for determining the time from solar or stellar altitude were equivalent to the trigonometric identity $2cos(a)cos(b)=cos(a+b)+cos(a-b)$ identified in Johannes Werner's 16th-century manuscript on conic sections. Now recognized as one of Werner's formulas, it was essential for the development of prosthaphaeresis and logarithms decades later.

Ibn Yunus described 40 planetary conjunctions and 30 lunar eclipses. For example, he accurately describes the planetary conjunction that occurred in the year 1000 as follows:

A conjunction of Venus and Mercury in Gemini, observed in the western sky: The two planets were in conjunction after sunset on the night [of Sunday 19 May 1000]. The time was approximately eight equinoctial hours after midday on Sunday ... . Mercury was north of Venus and their latitude difference was a third of a degree.

Modern knowledge of the positions of the planets confirms that his description and his calculation of the distance being one third of a degree is exactly correct. Ibn Yunus's observations on conjunctions and eclipses were used in Richard Dunthorne and Simon Newcombs' respective calculations of the secular acceleration of the moon.

Poetry

Ibn Yunus is also thought to have been an Arabic poet though this is uncertain.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.

Pendulum

Recent encyclopaedias and popular accounts continue to repeat the claim that the tenth century astronomer Ibn Yunus used a pendulum for time measurement, despite the fact that it has been known for nearly a hundred years that this is based on nothing more than an error made in 1684 by the Savilian Professor of Astronomy at Oxford and Arabist Edward Bernard.

References

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

• 
  
  My name is Dorris Bosanquet but everybody calls me Dorris. I'm from Iceland. I'm studying at the university (3rd year) and I play the Bass Guitar for 5 years. Usually I choose music from my famous films ;).
  I have two sister. I love Knitting, watching movies and Water sports.
  
  Also visit my blog post - http://Hostgator1Centcoupon.info/ (http://dawonls.dothome.co.kr/db/?document_srl=373691) (PDF version)
• Can a new property agent make $eight,seven-hundred inside her first 2.5 months? (See bolded part above) A couple of yr ago, I joined one of the top actual property firms in Singapore, and happened to be recruited beneath one of many high-selling divisions. I later left the business for personal causes, but I still receive work related sales figures, and I can honestly say that yes it is completely doable. I've seen the figures.
  
  Solely once you pass both paper in the RES exams, can you apply for the salesperson license with Council of Estate Agency through Knight Frank. An annual charge of $299.60 is payable to CEA for this license by means of Knight Frank. Create a Monetary Finances.is important given the up and down of this risky market place. Your monetary price range ought to plan for your advertising costs, any extra prices resembling training and your forecasted revenue. Fascinating, fascinated or still uncertain? Call Leon Low @ 9369 5588 and yow will discover out more on how he and his Staff members can assist you on this Actual Estate Business. See you actual quickly! By visitor contributor Getty Goh, Director of Ascendant Belongings , a real estate research and funding consultancy firm.
  
  One to One Mentoring Free Caveat Listings Complete In-Home Programs Paxel-On The Job Coaching (Zero value to agent) Be taught and Earn Prog. State-Of-The Artwork Residential and Commercial Property Information Mission new condo launches singapore Launches - Native and Overseas These are high 6 ways that you can do to claim your PIC grant as knowledgeable property agent. There are some necessary documents that you have to undergo the IRAS, so your application could be authorized quickly. This PIC grant allows you to develop your property agency company from the tax deduction or money payout choices. KS Tan, property agent (HSR International/Knight Frank), 90060063 (Starhub) Vincent Ong , property agent with Knight Frank, 98531741 (Starhub) and 81876384 LLB (Honours), College of London
  
  Resale Levy for Second-Timer Applicants – Previously second timers aren't required to pay a levy. This is applicable to only new EC land gross sales which are launched on or after 9th December 2013 Revision of Mortgage Loan Terms – From a earlier mortgage servicing ratio (MSR) stage of 60% to now 30% of a borrower's gross monthly revenue. The MSR cap will apply to EC purchases from at this time onwards. Property looking process is busy and thrilling, I am here to verify the expertise goes as smoothly as attainable by providing you with all of the provide help to need under one roof and to ensure your new home meets all of your expectations. Try to discover a companion to share an apartment through the next expatriate chat rooms. - Set Up A Digital Tour And Digital Open House Chesney Actual Property
  
  All potential consumers might be fastidiously screened by a single agent together with your requirement and scheduling in thoughts thus ensuring a peace of mind advertising effort. An Unique Agent is authorised to barter on your behalf because you each have a customized advertising and marketing strategy, thus leading to a sooner closure at the very best price. For properties that include each residential and non-residential portions, solely the non-residential portion is subject to GST. If you received the rental payment. Whole rental of the furnished flat = $four,500 per thirty days He wished to take up a business course in a polytechnic, however his grades did not qualify him to do so. One month's rental for the goodfaith deposit Rental Period of 4 years (48 months) or MUCH LESS Total rental x zero.004
  
  It is the sellers obligation to hand over the property upon authorized completion as agreed in the contract. Within the case of a HDB flat, vacant possession is a requirement. Plan your move early to prevent a final minute rush. Remove all your belongings and discard any unwanted furnishings and rubbish. Be sure that all fixtures and items within the inventory record are left behind. Invite the customer (as required by HDB) for an inspection earlier than completion. In the case of private properties, they are often sold with present tenancy or vacant possession. The gross sales contract will specify your authorized obligations. Examine with your agent in case you are in doubt.
  
  Moreover dedicating himself to the IP profession, Moo Kwang additionally contributes to the coaching and growth of expectant IP professionals by acting as a mentor and providing practical guidance to patent agent trainees. Moo Kwang is presently an adjunct lecturer at the Nationwide University of Singapore. He lectures on intellectual capital management and IP rights to engineering undergraduates. In a separate statement, trade promotion agency IE Singapore mentioned the nation's key exports rose 28 per cent in the second quarter from the 12 months earlier than, accelerating from a 23 per cent rise within the first quarter. - CNA/vm The aged are easy targets who may be coaxed into promoting and buying their property. Member of Institute of Estate Agent Housing Builders Guidelines
• 
  
  My name is Dorris Bosanquet but everybody calls me Dorris. I'm from Iceland. I'm studying at the university (3rd year) and I play the Bass Guitar for 5 years. Usually I choose music from my famous films ;).
  I have two sister. I love Knitting, watching movies and Water sports.
  
  Also visit my blog post - http://Hostgator1Centcoupon.info/ (http://dawonls.dothome.co.kr/db/?document_srl=373691)
• Ibn Yunus Biography

Template:Islamic astronomy Template:Islamic mathematics 30 year-old Entertainer or Range Artist Wesley from Drumheller, really loves vehicle, property developers properties for sale in singapore singapore and horse racing. Finds inspiration by traveling to Works of Antoni Gaudí.