work out (a solution to a problem or mystery) to manage to find the solution by thinking or talking about it; to figure out

Stonehenge A group of very large, tall stones that are arranged into a large circle with a smaller circle inside it, which stand on Salisbury Plain in Wiltshire, southern England. they were put there about 4000 years ago and were used for studying the movements of the Sun, Moon, and stars. Some people also believe that they were used by the Druids in religious ceremonies

obelisk A stone pillar, typically having a square or rectangular cross section and a pyramidal top, set up as a monument or landmark

shadow ['ʃædəu] A dark area or shape produced by a body coming between rays of light and a surface

sundial [sʌ̱ndaɪəl] A device used for telling the time when the sun is shining. The shadow of an upright rod falls onto a flat surface that is marked with the hours, and points to the correct hour.

hourglass ['auəglɑːs] An invertible device with two connected glass bulbs containing sand that takes an hour to pass from the upper to the lower bulb

accurate (of information, measurements, statistics, etc.) correct in all details; exact; (of an instrument or method) capable of giving such information

keep (on) doing sth to continue doing sth or to do the same thing many times

a means of sth/to do sth) an action or system by which a result is achieved; a method

ring bells if you ring a bell or if a bell rings, it produces a sound

pendulum a weight hung from a fixed point so that it can swing freely backward and forward, esp. a rod with a weight at the end that regulates the mechanism of a clock

Christiaan Huygens ['hʌɪgənz] (1629-95), Dutch physicist, mathematician, and astronomer. His wave theory of light enabled him to explain reflection and refraction. He also patented a pendulum clock, introduced the convergent eyepiece for telescopes, discovered a satellite of Saturn, and recognized the nature of Saturn's rings, which had eluded Galileo

turning point (in sth) The time when an important change starts, esp. one that improves the situation

tell the time BrE / tell time AmE [to an accuracy of (+ unit of measurement)]: to be able to know what time it is by looking at a clock

make sure to find out if sth is true or to check that sth has been done; to do sth that you can be certain of the result убедиться; удостовериться; обеспечить; постараться, позаботиться, принять меры

be stuck 1)(in a particular position, at a particular level or stage) to be fixed tightly in this position and is unable to move; not to be progressing or changing; 2) sb is stuck (in a place / in a boring, unpleasant or difficult situation or position)) sb wants to get away from it, but is unable to

junk mail Advertisements and publicity materials that you receive through the post which you have not asked for and which you do not want

on hold if you are on hold, you are waiting to talk to sb on the telephone

life expectancy The number of years that a person or animal is likely to live; the length of time that sth is likely to exist or continue for

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