Synchronicity is defined as two or more unrelated events that seemingly seem to be connected or end up connected in a unexplainable way.
Like so much else synchronicity and unsynchronicity range from the normal non-paranormal coincidental events of bad and good luck and circumstantial oddities of statistical probabilities. What put synchronicity into the field of paranormality is when it is combined with a strong feeling of fate and a faith that there is something more going on. In those respects is it similar to coincidences which on their own does not carry with them a paranormal element as described in the entry called Coincidences, Umberellas and Cars, and the entries of unlucky numbers like 13 Myth or Reality? and Curses, Evil Eyes, Hexes and Jinxes which deals more towards unsynchonicity, another example that could be described as an example of synchronicity is in the entry Abundance, where a chakra candle was used to change the synchronicity. All it is all part of the same cosmic flow of energy of the external and internal consciousness.
In some aspects synchronicity is one of the few phenomenas where anybody can greatly influence their own synchronicity, each and every time one do anything this triggers a new wave of synchronic ripples that cascades and reechoes touching and rippling the synchronicity of others. When I think about it astrology probably follow much of the same pattern of thought as the modern term Synchronicity describe, only in astrology one is using the spheres of the stars in the Kodiak, the Moon and the planets to tune in to your personal synchronicity or if you want your personal karma, destiny or opportunity.