Aspect:

When one planet is at a certain number of degrees away from another planet, they are said to be in aspect.
Aspects are reckoned from mutual longitude of planets.
The following are the major aspects:

The effect of an aspect is felt even if the planets are not exactly in the mutual distances mentioned above.
Therefore a so-called orb of aspect - and this varies in each aspect- is allowed.

Note: For Hindus, aspects are from sign to sign.
Mars sends an aspect to 3,6,7 sign from its position (set 0 to the sign where Mars is, and follow the zodiac order.
Jupiter 4,6,8
Saturn 2,6,9
For all other planets 6 (opposition)

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