When the sun, the Earth and the moon are aligned in space (nearly or perfectly), with the Earth between the sun and moon, then Earth's shadow falls on the moon's face. ... During a lunar eclipse, a very small amount of light from the sun filters through Earth's atmosphere onto Earth's shadow on the moon. During a solar eclipse, the Moon actually casts two shadows toward Earth. One shadow is called the umbra which becomes smaller as it reaches the Earth. This is the dark center of the Moon's shadow. The second shadow is called the penumbra.

A local time is a time calculated on the basis of a specific meridian passing through a particular place, though the place may be included in some other time zone. All the places located on the same meridian have noon at the same time. Places located on different meridians have different local times. Every gain or loss of 1° longitude stands for 4 minutes. 360° implies one complete rotation of earth. on every longitudinal degree increase towards west, substract 4 min. After the hours is calculated add(if east) or substract( if west) it with time of GMT.

Skilled gatherers are the tribal people or those who settled long ago in the forest areas or hilly areas, and used to collect / gather useful materials from the riverside, forest or mountain areas.

Like wood, flowers, coconut tree leaves, fruits, etc. and any other things which were useful to them to live by or to sell.  Perhaps they collected colored stones too.  They might have collected some alcohol from  palm trees or others,  bones or dead animals and husks etc...

Skilled gatherers are those who had skills in doing these activities.  Skills were required as gathering was risky in some regions or the task was some what difficult or needed a process.

India being the largest democracy in the world with a civilization more than five thousand years old boasts of multiple cultural origins. The cultural origins of the Indian subcontinent can be traced back to the Indus Valley Civilizations, the remains of which are cherished even today. Since the late 16th century India was under the influence of the British Empire until 15th August 1947 the day when India gained independence. India is a land of diverse cultures, religions and communities. There is great diversity in our traditions, manners, habits, tastes and customs. Each and every region of the country portrays different customs and traditions. But though we speak different languages yet we are all Indians. 'Unity in Diversity' has been the distinctive feature of our culture. To live peacefully has been our motto and this motto has helped us to achieve independence. As history tells us that there has been active participation from people of different caste and religion. In our struggle for freedom people from different communities participated keeping one thing in mind that they all are Indians first. But unfortunately this peace and understanding among different communities has been endangered lately. India at present is facing many problems. The biggest of these is the problem of communalism. In their personal fight they are destroying their life only. In fact, it is the biggest threat to humanity and to the unity and integrity of the country.

People from different background and culture participated in India's struggle for freedom. The national leaders, particularly Mahatma Gandhi, Nehru, Azad and Bose had coined the slogan unity in diversity There are numerous others who were also involved. Be it Hindu, Muslim, Buddhist, Jain and Sikhs everybody had a single identity of being an Indian. It should be understood that all of us have multiple identities religious, linguistic, cultural, regional and caste identities. No one can claim single identity. One who demands single identity i.e. national identity does not recognize the reality but during India's struggle for freedom no one thought in that manner they just thought of India's independence. Modern India presents a picture of unity in diversity where people of different faiths and beliefs live together in peace and harmony. Still today also India remains one of the most ethnically diverse countries in the world.

Chronological order refers to ordering events in accordance with the time sequence in which they occurred, ie an event that occurred in 1912 would be list d after an event that occurred in 1911 but before an event that occurred in 1913. Inverse chronological order would be the opposite of this.

Numismatics is the study or collection of currency, including coins, tokens, paper money and related objects. While numismatists are often characterised as students or collectors of coins, the discipline also includes the broader study of money and other payment media used to resolve debts and the exchange of goods.  Numismatics the study of coinage, and is a wonderfully useful tool in the archaeologist's and historian's toolbox. One of the best things for an archaeologist to find while digging is a coin. The reason is simple; it can instantly provide some date for the layer they are digging.

Greenland, the world’s largest island, lying in the North Atlantic Ocean. Greenland is noted for its vast tundra and immense glaciers.

The Northern Hemisphere contains North America, the northern part of South America, Europe, the northern two-thirds of Africa, and most of Asia. The Southern Hemisphere contains most of South America, one-third of Africa, Australia, Antarctica, and some Asian islands.

The largest planet in our solar system by far is Jupiter, which beats out all the other planets in both mass and volume. Jupiter’s mass is more than 300 times that of Earth, and its diameter, at 140,000 km, is about 11 times Earth’s diameter.

Inscriptions are the writings on stone, metal or some materials as an important historical source. These are valuable historical evidence of the existence and activities of early kings and empires. They also provide detailed religious practises.

An orbit is a regular, repeating path that one object in space takes around another one. An object in an orbit is called a satellite. A satellite can be natural, like Earth or the moon. Many planets have moons that orbit them.

Referent power is the power or ability of individuals to attract others and build loyalty. It is based on the charisma and interpersonal skills of the power holder. It literally means "The power is ours" but is used in a similar way as "Power to the People". The true definition of power is our ability to make our own choices. Sometimes power means taking something on…but sometimes it means choosing to let something go. Sometimes power means standing strong…but sometimes it means choosing to step aside.

Earth is only the fifth largest planet in the solar system, it is the only world in our solar system with liquid water on the surface. Just slightly larger than nearby Venus, Earth is the biggest of the four planets closest to the Sun, all of which are made of rock and metal.