Given a passage and a query based on the passage, generate an unambiguous, concise and simple answer to the query from information in the passage. Note that the answer may not be present in exact form.

Ex Input:
This complete lunar cycle (New Moon to New Moon) is also called a lunation. During this time the moon will completely circle the earth. That's the scientific definition, but you can take any phase; for instance a so-called full moon cycle would be from Full Moon to Full Moon. The calendar used earlier will appear, but on the right-hand side students can "Go to Lunar Cycle" where they can see images of a full lunar cycle and images of the main phases. You can choose to either have students use the esheet at the two-week point or wait until students have completed a full calendar. Hence the term golden number, still found in our almanacs, which denotes the year of the lunar cycle. Letters on Astronomy Denison Olmsted Thus, fourteen was the golden number for 1837, being the fourteenth year of the lunar cycle. Synodic months are 29 or 30 days in length, making a lunar year of 12 months about 11 days shorter than a solar year. Some lunar calendars do not use intercalation, such as most Islamic calendars. For those that do, such as the Hebrew calendar, the most common form of intercalation is to add an additional month every second or third year. A full lunar cycle lasts almost a month (about 29.5 days), and during that time the moon goes from new to crescent to first quarter to gibbous to full to gibbous to third quarter to crescent and back to new. However, a full moon, a new moon, ... To help students recognize that the moon looks a little different every day, but looks the same again about every four weeks, have them use the Moon Phases student esheet to go to the Lunar Cycle Calendar website. The New Moon is highest in the sky to an earthbound observer at (noon, sunset, midnight, sunrise). The Full Moon is highest in the sky to an earthbound observer at (noon, sunset, midnight, sunrise). Throughout the Lunar Cycle, the Moon will appear further (eastward, westward) in the sky at the same time each day. Therefore, to an earthbound observer, the time of day when the Moon is highest in the sky becomes progressively (earlier, later). However, misconceptions regarding the Moon's apparent change in shape still abound. Some believe that clouds or some other object cover up the Moon, blocking our view of part of it. This may happen, but it is not the mechanism behind the lunar cycle. Others believe that the shadow of Earth or some other object falls on the Moon's surface, causing the phases of the Moon. While the Moon does occasionally cross Earth's shadow, resulting in a lunar eclipse, shadows cast by Earth are not what cause lunar phases. Therefore, although mean Earth orbital eccentricity has a well-known effect on the short-term periodic variation of the length of the lunar cycle (find the word eccentricity on this page), it doesn't plausibly account for its long-term secular variation. In purely lunar calendars like the Islamic calendar, the lack of intercalation causes the lunar months to cycle through all the seasons of the Gregorian year over the course of a 33 lunar-year cycle. Query: how long is lunar cycle

Ex Output:
A full lunar cycle lasts almost a month about 29.5 days.

Ex Input:
Unfortunately, air conditioners don't live as long as people, and in the brutal conditions of Phoenix, Arizona, air conditioners can have remarkably short lives without proper care and maintenance. The average lifespan of an air conditioner is anywhere from 8 to 15 years, but it's hard to say exactly how long any given air conditioner unit will last. The Biggest Factors in Air Conditioner Lifespans Certain factors can influence how long your air conditioner survives, including the size of the air conditioner unit, your duct design, the amount of use and how much maintenance your unit receives. This allows you to control the flow of cooled air into each room of your home, keeping you more comfortable, and allowing your air conditioner to work more efficiently. Your central air conditioner is designed to last anywhere from 15 to 20 years. While there's a good chance it may last far longer, especially if you're meticulous about maintenance, there are still some very compelling reasons to replace it. Air Conditioner Use. Like anything else with moving parts, the more you use your air conditioner, the faster it's going to break down. No matter how good the unit, the more it runs, the sooner it will need to be replaced. Heat pumps -- If you have an electric heat pump heating system, plan on replacing the exterior unit after about 16 years. Thermostats -- Expect your home's thermostat(s) to last about 35 years. Electric radiant heaters -- The most common of this type of room conditioner might be baseboard heaters. The impact of these items can be minor by themselves, but when several parts of the equation are out of whack, your air conditioner may have a very short life. How the different factors can affect your unit: Air Conditioner Size. The size of your air conditioner affects how efficiently it works, as well as how frequently it switches on and off. The Lifespan of a Central Air Conditioner. Per the United States Department of Energy, the average lifespan of a central air conditioner is about 15 to 20 years. Some units may continue operating well beyond the 20-year mark, and others may need to be replaced before the 15 years has passed. How Long Does a Central Air Conditioner Last? Posted on February 8, 2017 by Glen Feurst Whether you're buying a home with central air already installed or you're thinking about replacing your elderly HVAC unit, it's important to understand that a central air conditioner isn't designed to last forever. Twenty years ago, the brand-new central air conditioner units that were available had an average SEER rating of about 12. Today, new systems have an average SEER rating that ranges from 16 to 18, which is far more efficient. The Biggest Factors in Air Conditioner Lifespans. Certain factors can influence how long your air conditioner survives, including the size of the air conditioner unit, your duct design, the amount of use and how much maintenance your unit receives. Ducting -- The NAHB estimates that the ductwork in your home should last about 10 years. A report done by InterNACHI might be more accurate on this HVAC component: their study indicates that ducts should function properly for 60 to 100 years. Query: how long does a central air conditioner last

Ex Output:
A central air conditioner lasts 15 to 20 years.

Ex Input:
Children can learn a great deal by example, so it really helps if their older brothers and sisters enjoy chess. As with anything in life, chess takes practice. It's a bit like learning a language. Chess educators Laura Sherman and Bill Kilpatrick have created an easy, step-by-step method for teaching chess that parents of all skill levels can use to teach children of any age. You don't have to know how to play in order to use the system. It's completely impossible to actually teach her chess at this age though. So the answer to the question can only be it depends entirely on the child. Whenever the kid becomes interested in learning chess is the best age. (that said, if they taught the rules of chess at school right now, she'd probably soak them up. Best Answer: I have taught chess play to kids as young as 3. The age doesn't matter. Here are the signs to look for: 1. The child knows how to share and take turns. 2. The child asks you to show them first. 3. Some children would stuggle with chess when they are ten or twelve. For that matter, some adults struggle with chess. So being prepared to learn to play chess is not so much tied up in a number such as an age, as in the mental capacity to comprehend the game and the interest to learn it. At schools where I have worked chess clubs usually start for children at about second or third grade, so at about 7 or 8 years of age. The purposes of integrated Ho Math and Chess program are to: 1 improve school math marks. 2 improve problem solving ability and critical thinking ability. 3 learn how to play chess. 4 boost brainpower. I can teach a three year old to play violin... I'm pretty sure I can teach them checkers too. I'm a year late, but I'll try it out on my four year old and let you know how it turns out. My husband taught our son to play when he was 6 yrs old (he is now 9). Our daughter who is now 6 learned when she was 5 (she is very competitive with her older brother)! That being said, I don't think age really matters. It's more about being able to learn the pieces and how they move. After learning the pieces and moves, the key was to learn to anticipate what the opponent might do based on your move (like checkers). #17 Jul 25, 2010. Children should not learn chess! Let them grow up to be Physicists, Mathematicians, Engineers, Artists, anything but a worthless Grand Master chess palyer at the age of 21! Chess is a waste of time and there is no money in it: it is a hell of way to try to live as a Professional Chess player. Perhaps they were taught the rules too quickly and never quite grasped them. These parents sometimes feel that a child must be a genius in order to pick up chess and play a game. This isn't the case. Anyone can learn to play and the fact is that chess helps children become smarter. Tackling this problem, Chess Is Child's Play teaches the parent to play, while teaching them to teach their child. Even a parent who has never seen a chess set can pick up this book and teach their children. Query: at what age can children learn chess

Ex Output:
Whenever the kid becomes interested in learning chess is the best age.