The moon is “ waxing ” when its illuminated surface is increasing from new to full moon, and it is said to be “ waning when it is decreasing from full moon back to new moon again. When “ waxing ” the … [Read more...] about When Is the moon said to be waxing ? waning ? How can you tell whether it is waxing or waning ?
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A sun-dial is a device for showing the time by means of the shadow cast by a rod. The hours are marked on a flat surface below the rod. … [Read more...] about What is a sundial;How a sundial works?
The wind blows against the broad end of the vane, and carries it with it. This causes the point of the vane to face the wind. Hence the point of a weather-vane always faces in the direction from which … [Read more...] about How can you read a weathervane ?
A weathervane is a thin plate of metal or wood cut into the form of an arrow or some fanciful device. I t is mounted on a vertical rod, and responds freely by rotation to the force of the wind. It is … [Read more...] about What are weathervanes, and why are they placed in prominent positions ?
Before the mariner’s compass was invented sailors were dependent during the night upon stars. Two stars in the Great Bear are called “ pointers ” because they point towards the North Star which marks … [Read more...] about How can the points of the compass be determined on a starry night ?