CLASS 6TH DAY 2
INTRODUCTION
Origin of the Constellations
Ever since people first wandered the Earth, great significance has been given to the celestial objects seen in the sky. Throughout human history and across many different cultures, names and mythical stories have been attributed to the star patterns in the night sky, thus giving birth to what we know as constellations.
When were the first constellations recorded? Archaeological studies have identified possible astronomical markings painted on the walls in the cave system at Lascaux in southern France. Our ancestors may have recorded their view of the night sky on the walls of their cave some 17 300 years ago. It is thought that the Pleiades star cluster is represented alongside the nearby cluster of the Hyades. Was the first ever depiction of a star pattern made over seventeen millennia ago?
Learning the constellations is fun and easy. Moreover, knowledge of the night sky can provide hours of enjoyment whenever you look up on a clear night.
>>USING A STAR CHART
A star chart is a map of the night sky. With it, you can identify and locate constellations and stars. A typical star chart (see below) shows the relative positions of the stars and their brightness.
Chart of Winter Sky
To use a star chart to identify stars and constellations, you must first find the one appropriate for the time of year you are observing. Notice that the chart above is labeled “Winter.” Picking the chart appropriate for the season is important because as the Earth orbits the Sun, the Sun’s glare hides many of the stars.
Because each night the stars move across the sky, rising in the east and setting in the west, you also need to consider the time of night.
Once you have found the appropriate chart, you need to match it to the sky. First, you should match direction. That is, if you are looking south, you need to orient the chart so it shows the southern sky.
With the correct chart in hand you are now ready to match it to the night sky. Two steps are helpful here. First, look for star patterns. Second notice the relative brightness of stars in the pattern. The chart shows the relative brightness of the stars by their size. Dim stars are shown as tiny dots. Bright stars are shown by big dots.
Watch the documentary “Exploring The Southern Stars” to Explore stars in our galaxy!!👇 👇
Blood Relations
Mother’s or father’s son | Brother |
Mother’s or father’s daughter | Sister |
Mother’s or father’s brother | Uncle |
Mothers or father’s sister | Aunt |
Mothers or father’s father | Grandfather |
Mother’s or father’s mother | Grandmother |
Son’s wife | Daughter-in-Law |
Daughter’s husband | Son-in-Law |
Husband s or wife’s sister | Sister-in-Law |
Husband’s or wife’s brother | Brother-in-Law |
Brother’s son | Nephew |
Brother’ daughter | Niece |
Uncle or aunt’s son or daughter | Cousin |
Sister’s husband | Brother-in-Law |
Brother’s wife | Sister-in-Law |
Grandson’s or Grand daughter’s daughter | Great grand daughter |
In this type of questions, a round-about description is given in the form of certain small relationships and direct relationship between the persons concerned is to be Deciphered.
TYPE 1 SIMPLE BLOOD RELATION QUESTIONS
Ex. 1. Pointing to a photograph, a man said, I have no brother or sister but that man’s father is my father’s son.” Whose photograph was it ?
(a) His own
(b) His son’s
(c) His father’s
(d) His nephews
(e) None of these
Sol. Since the narrator has no brother, his father’s son is he himself. So, the man who is talking is the father of the man in the photograph or the man in the photograph is his son. Hence, the answer is (b).
Ex. 2. Anil introduces Rohit as the son of the only brother of his father’s wife. How is Rohit related to Anil ?
(a) Cousin (b) Son (c) Uncle (d) Son-in-law ‘ (e) Brother
Sol. The relations may be analyzed as follows : Fatheis wife — Mother; Mother’s brother — Uncle; Uncle’s son — Cousin. So, Rohit is Anil’s cousin. Hence, the answer is (a).
Ex. 3. Pointing out to a photograph, a man tells his friend, “She is the daughter of the only son of my father’s wife.” How is the girl in the photograph related to the man ?
(a) Daughter (b) Cousin (c) Mother (d) Sister (e) Niece
Sol. The relations may be analyzed as follows :
Father’s wife — Mother; Mother’s only son — Himself. So, the girl is man’s daughter. Hence, the answer is (a).
Ex. 4. X introduces Y saying, He is the husband of the grand daughter of the-father of my father.” How is Y related to X ?
(a) Brother (6) Son (c) Brother-in-law (d) Nephew (e) Son-in-law
Sol. The relations may be analyzed as follows : Father’s father — Grandfather, Grandfather’s Grand daughter — Sister; Sister’s husband — Brother-in-law. So, Y is X’s brother-in-law. Hence, the answer is (c).
Ex. 5. Pointing out to a lady, Rajan said, “She is the daughter of the woman who is the mother of the husband of my mother.* Who is the lady to Rajan ?
(a) Aunt (b) Grand daughter (c) Daughter (d) Sister (e) Sister-in-law
Sol. The relations may be analysed as follows : Mother’s husband — Father, Father’s mother — Grandmother; Grandmother’s daughter — Father’s sister; Father’s sister — Aunt. So, the lady is Rajan’s aunt.
Hence, the answer is (a).
FUN ACTIVITY
Find pictures of you right from your childhood and make a timeline of your life.
STEP 1: Collect pictures of you since when you were a child.
STEP 2: Arrange them in descending order of age.(oldest first)
STEP 3: Click pictures and make a short video (can use Google photos for making the video)
STEP 4: Share it with your family and friends.
