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This paper discusses the historical evidence for the light jets from thecentral Super Massive Black Hole of Galaxy in the 4th and 14th centuries. Wesuggest that the apparitions of a "lightening cross" recorded in 312, 351, 1317and 1377 years were caused by the line of two jets beamed back-to-back from thecenter of Milky Way (MW), which is crossing the visible projection of theGalaxy disk. All historical accounts give precise time and geographicallocations, where from X-crosses was seen: in the vicinity of Rome, inJerusalem, in Tver' (the vicinity of Moscow) and in night sky over Moscow,respectively). The positions of the Sun (or the Moon) were also mentioned inthe Middle Age manuscripts. These positions coincide with the location of theMW center on the sky map in these specific places and dates, as it is shownwith the help of Wolfram Astronomy visualization instruments. We suggest thatthe gap between jet activity events is about thousand years. The X cross in thesky was mentioned by Plato in {\it Timaeus}\cite{plato}, but he cannot beeyewitness and could only take this from the narratives of older ancient sages.The X cross pictures are multiply stamped on Roman coins. Nowadays, such anevent would easy get the interpretation as a technological catastrophe in theatmosphere. It is also important that the 4th and the 14th centuries were timeswhen the climate vent colder. The processes in Galaxy are often periodicbecause of orbital movements, so we should consider the thousand years periodsin the climate changes as well.

Jet Activity in the Central Super Massive Black Hole of the Milky Way in 4th and 14th centuries and millennium periods of climate change