schoolscienceproject.blogspot.in
The earth rotates in 24
hours from west to east once on its axis. In this time the sun shines on all
regions of the globe one after the other and determines their time of day. To
enable a practical calculation of the time, the earth is divided into 24 time zones,
which are very simply shown on the map below. Since in a few areas, which
belong together, a uniform time has been introduced, the boundaries of the time
zones sometimes run along state boundaries. For example, Mexico has Central time.
The West European countries including Great Britain has together with the
Middle European countries, Middle-European time. According to the map, when it
is 13.00 hours there it is only 7 o’clock in the morning on the East Coast of
the U.S.A. in Japan it is already 21 .00 hours and on the right edge (dateline:
a new day is beginning. The time zones are shown on the world time disk
pictured below. Copy or stick this onto a piece of cardboard and cut it out.
Colour the panel corresponding to time zone were you live red. Remove the
casing and glass from an alarm clock, push the minute hand through the hole in
the paper disk and fix it firmly to the hour hand. Make sure that the red-coloured
panel is exactly over the hour hand. If you rotate the disk with this, it
should not stick. The clock will tell you all time of the day on the earth. Read off first on the red panel the time of
the place where you live. If you rotate the disk to the left, you will find the
time zones of places west of you. In each panel, the time is an hour earlier.
If you rotate to the right, you will find the places east of you. In each panel
the time is an hour later. The outer circle continues into the inner circle at
the crossed arrows and vice-versa. For example: in New York it is 6.15 in the
morning. Then it is already 20.15 in Tokyo and in New Zealand a new day will
begin in 45 minutes. Or in London it is 20.03. What time is it in San
Francisco? Look at the world map: San Francisco lies in the time zone of Los
Angeles. On the rotating disk go to the left to the Los Angeles panel. The time
is: 11.03.
The earth rotates in 24
hours from west to east once on its axis. In this time the sun shines on all
regions of the globe one after the other and determines their time of day. To
enable a practical calculation of the time, the earth is divided into 24 time zones,
which are very simply shown on the map below. Since in a few areas, which
belong together, a uniform time has been introduced, the boundaries of the time
zones sometimes run along state boundaries. For example, Mexico has Central time.
The West European countries including Great Britain has together with the
Middle European countries, Middle-European time. According to the map, when it
is 13.00 hours there it is only 7 o’clock in the morning on the East Coast of
the U.S.A. in Japan it is already 21 .00 hours and on the right edge (dateline:
a new day is beginning. The time zones are shown on the world time disk
pictured below. Copy or stick this onto a piece of cardboard and cut it out.
Colour the panel corresponding to time zone were you live red. Remove the
casing and glass from an alarm clock, push the minute hand through the hole in
the paper disk and fix it firmly to the hour hand. Make sure that the red-coloured
panel is exactly over the hour hand. If you rotate the disk with this, it
should not stick. The clock will tell you all time of the day on the earth. Read off first on the red panel the time of
the place where you live. If you rotate the disk to the left, you will find the
time zones of places west of you. In each panel, the time is an hour earlier.
If you rotate to the right, you will find the places east of you. In each panel
the time is an hour later. The outer circle continues into the inner circle at
the crossed arrows and vice-versa. For example: in New York it is 6.15 in the
morning. Then it is already 20.15 in Tokyo and in New Zealand a new day will
begin in 45 minutes. Or in London it is 20.03. What time is it in San
Francisco? Look at the world map: San Francisco lies in the time zone of Los
Angeles. On the rotating disk go to the left to the Los Angeles panel. The time
is: 11.03.
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