41 months is how long
41 months is how long
Мы используем for и since, чтобы сказать о том, как долго (how long) что-либо происходит (has been happening).
Мы используем for + промежуток времени (two hours, six weeks и др.):
Мы используем since + начало промежутка времени (8 o’clock, Monday, 2009 и др.):
for
since
Можно не включать for в предложение (но обычно не в отрицательных предложениях и лучше не привыкать к этому):
A: When did it start raining?
B: It started raining an hour ago / at 1 o’clock.
A: How long has it been raining?
B: It’s been raining for an hour / since 1 o’clock.
| A: When did Joe and Carol first meet? | ||
| B: They first met | < | a long time ago. |
| when they were at school. | ||
| A: How long have they known each other? | ||
| They’ve known each other | < | for a long time. |
| since they were at school. | ||
Мы говорим ‘It’s (a long time / two years etc.) since something happened’:
Упражнения
1. Выберите for или since.
2. Напишите вопросы с how long и when.
3. Прочитайте ситуации и закончите предложения.
4. Напишите предложения B, используя слова в скобках.
The 12 Months of the Year
A year is divided into 12 months in the modern-day Gregorian calendar. The months are either 28, 29, 30, or 31 days long.
The Gregorian calendar is divided into 12 months.
Each month has either 28, 30, or 31 days during a common year, which has 365 days. During leap years, which occur nearly every 4 years, we add an extra (intercalary) day, Leap Day, on 29 February, making leap years 366 days long.
This is to keep our current calendar aligned with the solar year and astronomical seasons marked by equinoxes and solstices.
The 12 Months
The Gregorian calendar consists of the following 12 months:
Tracking the Moon’s Orbit
The months originated as a way to mark time and break up the year into shorter periods based on the Moon’s orbit around Earth. The word month is even derived from the word Moon.
As far as we know, months were first used in Mesopotamia sometime between the years 500 BCE and 400 BCE to measure the natural period related to the lunar month, or synodic month, which is the time it takes for the Moon to go through all the Moon phases.
How Many Have 28, 29, 30, or 31 Days?
The Gregorian calendar has 4 months that are 30 days long and 7 months that are 31 days long. February is the only month that is 28 days long in common years and 29 days long in leap years.
From 10 to 12 Months
Our current Gregorian calendar and its predecessor, the Julian calendar, both have 12 months. However, the month names we use today are derived from the Roman calendar, which initially had only 10 months, with the calendar year starting in March (Martius).
The Romans named some of the months after their position in the calendar year: September means the 7th month, October the 8th, November the 9th, and December the 10th month. However, when January and February were eventually added and the beginning of the calendar year was moved to January, the position of these months no longer corresponded with the original meaning of their names. Today, we still call the 9th month of the year September, the 7th month.
The Islamic calendar, the Hebrew calendar, and the Hindu calendar also use months to divide up the year. Although the Gregorian calendar is the most commonly used calendar today, other calendars are still used in many parts of the world to calculate certain holidays and annual feasts.
Old Names of Months
Months in the ancient Roman calendar include:
A Day Is Not Exactly 24 Hours
Exact Day Length* — вск 14 авг 2022 г.
Today’s prediction: 23 hours, 59 minutes, 59,9997882 seconds (-0,2118 milliseconds)
Yesterday’s prediction: 23 hours, 59 minutes, 59,9997162 seconds (-0,2838 milliseconds)
At the start of today, UT1 was 0.0283839 seconds behind UTC.
* Based on mean solar day. Numbers provided by the International Earth Rotation and Reference System Service (IERS).
The Earth’s rotation slows down over time.
Earth’s Rotation Defines Length of Day
Modern timekeeping defines a day as the sum of 24 hours—but that is not entirely correct. The Earth’s rotation is not constant, so in terms of solar time, most days are a little longer or shorter than that.
The Moon is—very gradually—slowing the Earth’s rotation because of friction produced by tides. Over the course of a century, the length of a day increases by a couple of milliseconds (where 1 millisecond equals 0.001 seconds).
Within this general trend, however, there is fluctuation: sometimes the Earth spins a bit faster, sometimes a bit slower. Recently, our planet has been speeding up a little, making for slightly shorter days.
How Long Is Today?
Today is predicted to be 0,2118 ms (milliseconds) or 0,0002118 seconds shorter than 24 hours. This is the time it takes Earth to rotate 9,85 cm (3,88 in), as measured at the equator.
This means that today lasts:
If every day were as long as today, a negative leap second would have to be added every 4721,44 days.
Average Day Lengths & Leap Seconds
Overall, the Earth is a good timekeeper: the length of a day is consistently within a few milliseconds of 86,400 seconds, which is equivalent to 24 hours. However, over the course of months and years, these small differences can add up and put our clocks out of sync with the Earth’s spin. When this happens, a leap second is used to bring them back into alignment.
Leap seconds can be positive or negative. A positive leap second adds a second to our clocks, while a negative leap second subtracts a second.
The system of leap seconds was introduced in 1972. So far, there have been 27 leap seconds, and they have all been positive. The table below shows the yearly average day lengths since 1973.
How Is True Day Length Measured?
Astronomers and timekeepers express mean solar time as Universal Time (UT1), a time standard based on the average speed of the Earth’s rotation. UT1 is then compared to International Atomic Time (TAI), a super-precise time scale calculated by a network of atomic clocks.
The actual length of a day is expressed as the deviation of UT1 from TAI over 24 hours.
Why Isn’t Earth’s Rotation Constant?
The speed of the Earth’s rotation varies from day to day. One of the main factors are the celestial bodies surrounding us.
For example, the Moon’s gravitational pull causes tides and changes the Earth’s shape, ultimately resulting in a lower rotational speed. The distance between Earth and Moon changes constantly, which makes for daily variations in the speed our planet rotates around its axis.
Find Day Length for Any Date
How Far Back Does the Data Go?
Super-accurate atomic clocks were first developed in the 1950s and 1960s. So measurements of the Earth’s rotation using atomic clocks only go back as far as then.
However, telescopic timings of stellar occultations by the Moon provide information about the Earth’s rotation going back to the 17th century. An occultation is when the Moon, as seen from the Earth, passes in front of a star.
Ancient Records Give Away Earth’s Speed
Going back even further, records of solar and lunar eclipses provide information from the 8th century BCE onwards.
For example, a Babylonian clay tablet tells us that a total solar eclipse was observable in the ancient city of Babylon on April 15, 136 BCE.
Modern computer models can calculate the path of totality for this eclipse with a high degree of accuracy. From this, we can work out the Earth’s spin. For instance, if the Earth had been spinning a bit faster at that time, the path of totality would have passed to the west of Babylon—not directly over the city.
How many years in 41 months?
41 months equals 3.41667 years or 41 m = 3.41667 y
All In One Units Converter
Quote of the day.
How to transform months into years?
To convert a value from months to years, just multiply the number of months by 1 /12 (conversion factor). Use the formula below to convert from months to years:
Value in years = value in months × 1 /12
Suppose you want to convert 41 months to years. In this case, just do the «math» below:
Value in years = 41 × 1 /12 = 3.41667 (years)
This calculator answers questions like:
Months to years conversion chart near 41 months
| Months to years conversion chart | ||
|---|---|---|
| 32 months | = | 2 2 /3 years |
| 33 months | = | 2 3 /4 years |
| 34 months | = | 2.83 years |
| 35 months | = | 2.92 years |
| 36 months | = | 3 years |
| 37 months | = | 3 1 /12 years |
| 38 months | = | 3 1 /6 years |
| 39 months | = | 3 1 /4 years |
| 40 months | = | 3 1 /3 years |
| 41 months | = | 3.42 years |
| Months to years conversion chart | ||
|---|---|---|
| 41 months | = | 3.42 years |
| 42 months | = | 3 1 /2 years |
| 43 months | = | 3.58 years |
| 44 months | = | 3 2 /3 years |
| 45 months | = | 3 3 /4 years |
| 46 months | = | 3.83 years |
| 47 months | = | 3.92 years |
| 48 months | = | 4 years |
| 49 months | = | 4 1 /12 years |
| 50 months | = | 4 1 /6 years |
Note: some values may be rounded.
Examples of Conversions between Time Units
Disclaimer
While every effort is made to ensure the accuracy of the information provided on this website, neither this website nor its authors are responsible for any errors or omissions. Therefore, the contents of this site are not suitable for any use involving risk to health, finances or property.
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Английский для всех простым языком
HOW LONG или HOW MUCH — как правильно?
Разницы между ними — нет, значения обеих фраз — одинаковы и правильны.
Но! есть одно «но» — о нем ниже.
How long — как давно/как долго, сколько времени?
How much time — как много, сколько по времени?
«How long» — вопрос о времени (минуты, дни, недели, месяцы, годы). Наиболее распространенное использование в разговоре. Более естественно, чем how much time.
«How much time» — тоже самое — вопрос о времени (мин,дни,мес.годы), но менее используется сами носителями.
How much time have you waited? — ты долго ждал?
How long have you studied English? — Как давно/долго/сколько времени ты изучаешь английский?
«How many times» — переводится как: сколько раз.
How many times did you fly? — сколько раз ты летал?
How many times did you eat today? — сколько раз ты кушал сегодня?
Проверьте себя еще раз:
«How long time have you been here?» — НЕ ПРАВИЛЬНЫЙ ВАРИАНТ.
«How long have you been here?» — ПРАВИЛЬНЫЙ ВАРИАНТ. Как давно ты здесь?
«How long have you lived in Spain?» — ПРАВИЛЬНЫЙ ВАРИАНТ. Как долго ты живешь в Испании?
«How many time have you been here?» — НЕ ПРАВИЛЬНЫЙ ВАРИАНТ.
Выжимка сделана из вот этого видео