  Transiting planets provide a unique opportunity to search for unseen
additional bodies gravitationally bound to a system. It is possible to detect
the motion of the center-of-mass of the observed transiting planet-host star
duo due to the gravitational tugs of the unseen bodies from the Roemer delay.
In order to achieve the goal, determination of the mid-times of the transits of
the planets in high precision and accuracy and correct them for the orbital
motion of the Earth is a primary condition. We present transit timing
variations and update the ephemeris information of 5 transiting planets;
HAT-P-23b, WASP-103b, GJ-1214b, WASP-69b, and KELT-3b within this contribution,
based on all the quality transit light curves from amateur and professional
observers, converted to Dynamic Barycentric Julian Days (BJD-TDB).
