1. What’s the solution ?
Amit wants to take his granny to
Australia which is in the southern
hemisphere. But she cannot bear very
cold weather. When should they make
this trip ?
2. Use your brain power !
(a) How many rotations does the earth
complete during one revolution
around the sun ?
(b) It is sunrise at Itanagar in Arunachal
Pradesh. Write the names of the
following cities in the order in
which the sun will rise there.
Mumbai (Maharashtra), Kolkata
(West Bengal), Bhopal (Madhya
Pradesh), Nagpur (Maharashtra).
3. Fill in the blanks.
(a) The motion of the earth around
itself is called ................ .
(b) The motion of the earth around the
sun is called ............. .
Activity
Find the names of the various ‘tithis’
using a calendar which shows them.
Exercises
(c) The rotation of the earth gives rise
to .............. .
4. What is meant by each of the following
terms ?
(a) Full moon
(b) New moon
(c) Lunar month
(d) Tithi
5. Answer the following questions.
(a) What is the equator ?
(b) What are the two parts of the earth
made by the equator ?
Answers
Answer:
1)Amit's granny cannot bear cold weather
2)This means, during one revolution around the sun, the earth performs 365 and 1 4 rotations. (ii) It is sunrise at Itanagar in Arunachal Pradesh.
3) a)Rotation
b)Revolution
c) Day and Night
4) a)The full moon is the lunar phase when the Moon appears fully illuminated from Earth's perspective. This occurs when Earth is located between the Sun and the Moon. This means that the lunar hemisphere facing Earth – the near side – is completely sunlit and appears as a circular disk.
b)In astronomy, the new moon is the first lunar phase, when the Moon and Sun have the same ecliptic longitude. At this phase, the lunar disk is not visible to the unaided eye, except when silhouetted during a solar eclipse. Daylight outshines the earthlight that dimly illuminates the new moon.
c)In lunar calendars, a lunar month is the time between two successive syzygies. The precise definition varies, especially for the beginning of the month. For other definitions, including a description of a month in the calendars of different cultures around the world, see: month.
d)In Vedic timekeeping, a tithi is a lunar day, or the time it takes for the longitudinal angle between the Moon and the Sun to increase by 12°. In other words, a tithi is a time-duration between the consecutive epochs that correspond to when the longitudinal-angle between sun and moon is an integer multiple of 12°.
5) a)The Earth's Equator, spelled with capital E, is a specific case of planetary equator. It is about 40,075 km long, of which 78.8% lies across water and 21.3% over land. In spatial geometry, as applied in astronomy, the equator of a rotating spheroid is the parallel at which latitude is defined to be 0°.
b)The Equator, or line of 0 degrees latitude, divides the Earth into the Northern and Southern hemispheres. The Northern Hemisphere contains North America, the northern part of South America, Europe, the northern two-thirds of Africa, and most of Asia.
hope it helped you ... :)