Astronomy & Astrophysics is a subject which attracts people of all ages; from a school going student to a person enjoying superannuation. The text deals with the fundamentals of Astronomy and Astrophysics. After briefing about the beginning of Astronomy, we have discussed various coordinate systems used to specify position of a place on the earth and an object in the space. Time is an important parameter and can help in having information about the relative occurrences of various events. The limitations of the observations with our eyes can be largely extended with the help of telescopes. Further, the telescopes help us for making observations of those radiations which cannot be seen by human eyes.