ways to predict tide occurrence using the calendar
DESCRIPTION
A discussion on how to predict the occurrence of tides by using the calendar and by observing the moon phases. It also discuses about the different types of tides and how it affects people.TRANSCRIPT
Group 2
Ways to Predict Tides Occurrence
Using the Calendar
Knowing how to predict the tide occurrence gives many advantages to people especially to fisher folks. They can know in advance when it is best to fish which results to a very good catch. Also, it also warns them when it is going to have a very high tide so that they can prepare.
OCTOBER CALENDAR
NOVEMBER CALENDAR
SUN. MON. TUE. WED. THURS. FRI. SAT.
1 2
3 4 5 6 8 9
10 11 12 13 15 16
17 18 19 20 21 23
24 25 26 27 28 29
31
SUN. MON. TUE. WED. THURS. FRI. SAT.
1 2 3 4 5
7 8 9 10 11 12 13
15 16 17 18 19 20
21 23 24 25 26 27
28 30
Spring tides
Spring tides occur during the full
moon and the new moon. At
these times, the high tides are
very high and the low tides
are very low because the gravitational
pull of the moon and sun
are combined.
Neap tide
Neap tides occur when the gravitational
forces of the moon and the sun are perpendicular to one another (with respect
to the earth)or at right angles, causing the bulges to cancel each other. The result is a smaller difference between high and
low tides and is known as a neap tide.
FIRST QUARTER
NEW MOON
LAST QUARTER
FULL MOON
SUN
SPRING TIDE
How the moon’s and sun’s gravity affect the earth
Effects of High tides
• High tides can cause a lot of trouble to the people living in low-lying and coastal communities especially those living close to sea because their houses can be flooded and damage their fish businesses.
Effects of Low tides
• Fishermen do not usually fish when it is low tide because the water is too far from the shore and fishes are farther.
• Also, it is hard for seafarers to dock their ship near the shore.
How to predict when the next major phase
of the moon will occur
What is the meaning of prediction anyway?
• Prediction is the making of a statement or forming of an opinion about what will happen in the future.
Step 1:
Add seven days from the last major phase in a particular month.
SUN. MON. TUE. WED. THURS.
FRI. SAT.
1 2
3 4 5 6 8 9
10 11 12 13 15 16
17 18 19 20 21 23
24 25 26 27 28 29
31
SUN. MON. TUE. WED. THURS. FRI. SAT.
1 2 3 4 5
7 8 9 10 11 12 13
15 16 17 18 19 20
21 23 24 25 26 27
28 30
OCTOBER CALENDAR
NOVEMBER CALENDAR
Step 2:
• Add again seven days to get the next major moon phase. Predictions are not always exact but it’s okay as long as it is within the area.
SUN. MON. TUE. WED. THURS. FRI. SAT.
1 2 3 4 5
7 8 9 10 11 12 13
15 16 17 18 19 20
21 23 24 25 26 27
28 30
• Again, add seven days to get the next major phase.
Step 3:
SUN. MON. TUE. WED. THURS. FRI. SAT.
1 2 3 4 5
7 8 9 10 11 12 13
15 16 17 18 19 20
21 23 24 25 26 27
28 30
Step 4:
• Add seven days again to get the prediction of the next major moon phase.
SUN. MON. TUE. WED. THURS. FRI. SAT.
1 2 3 4 5
7 8 9 10 11 12 13
15 16 17 18 19 20
21 23 24 25 26 27
28 30
Example
• For example, the date of the New Moon Phase is November 6 . Count 14 days, so, it’s November 20. Then, add the date of the New Moon Phase by the number obtained (20+6=26). After that, divide 26 by 2, answer is 13. That is when the 1st Quarter phase will occur.