The Stardial - AstroMedia
Product number:
221.ASU
Cardboard kit for a star clock that can be used to tell the time by looking at the starry sky. Including sailor astrolabe.
Not groping in the dark
How did people in earlier times tell the time at night? This reconstruction of the Stardial invented about 500 years ago makes use of the fact that the constellation Big Dipper orbits Polaris once in 23 hours and 56 minutes, as if it were the hand on a giant clock. Because of the difference of 4 minutes compared to a whole day, the sidereal clock is set to the current date before reading, then it shows the True Local Time with amazing accuracy. You can even feel it with your fingertips in the dark.On the back of the large sundial is a sailor's astrolabe for determining the altitude of the sun, stars and landmarks.
How it works
Turn the date disc until the day's date is in the reading window of the handle above the arrow mark. Find the constellation Big Dipper and from there the North Star. Hold the star clock by the handle so that it points vertically downwards and, with your arm half bent, take a bearing on Polaris through the hole in the axle. Turn the star pointer until its straight edge is parallel to the two rear stars of the carriage. The Big Dipper on the star clock is now positioned like the one in the sky. Read the True Local Time in the reading window of the star hand or feel the time using the long and short prongs of the hour disc.Small star clock
In addition, we offer a star clock in postcard format - 283.PKUas well as a simple star clock to cut out - 103.STU
| Aspiration scale: | Medium |
|---|---|
| Time Line: | 1,5 Hours |
Product information "The Stardial - AstroMedia"
sturdy kit made of die-cut cardboard and with noble gold print
Size of the built article:
total: 21 x 23 cm (Ø of the disc: 16 cm, plus 5-7 cm handle)
Die Große Sternenuhr - Deutsch
What you need for the assembly
> a sharp cutter knife, e.g. craft knife
> a good all-purpose glue, e.g. craft glue
> some fine sandpaper, e.g. sand sheet craft file
Quantity
Unit price
To
10
€14.80
To
25
€14.06
-5 %
To
100
€13.32
-10 %
From
101
€12.58
-15 %