Timeline
Old Republic Date Imperial Year Description
20177 1 Supreme Chancellor Palpatine brings an end to the corruption of the Republic, founding the Empire and ushering in a new era of peace, prosperity and order. Among the new Emperors first moves is the streamlining of the government and the de-federalization in favor of a more efficient Imperial model. The Senate of the Republic is vastly reduced in number to just the more intelligent species, so naturally it is composed mostly of humans.
20177 1 Emperor Palpatine outlines the major points of his government in the Principles of the New Order. Alien malcontents begin a riot on Coruscant, it is quickly put down by then Rear Admiral Wilhuff Tarkin. 
20177 1 Emperor Palpatine recognizes the need to reorganize galactic government and establishes the system of Regional Governors (Grand Moffs) and replaces senatorial government with the Sector Governors (Moffs). The Senate is retained as an advisory body to keep the Emperor informed about the needs of his subjects.
20178 2 After continued alien uprisings Emperor Palpatine issues the Alien Containment Decree to guarantee both Human and alien safety within the Empire. This same year in an effort to further bolster the galactic economy the Emperor orders a massive military buildup. This move meets some minor resistance amongst the more flamboyantly liberal members of the Imperial Senate. 
20181 5 Emperor Palpatine issues the Expansion Decree. Hutt-space and most of the present Outland Regions are annexed. 
20186 10 The prototype Star Destroyer 'Imperial' is launched, the Emperor Himself initiates the launch sequence. The Imperial class ships will become the backbone of the modern Imperial navy.
20193 17 First, and only attack by the Jono'Siil Confederacy, the Empires subsequent annihilation left no known survivors of this small enclave. Senator Mon Mothma leads a protest within the Imperial Senate resulting in her censure by the Imperial Senate.
20201 25 Grand Moff Tarkin proposes the first Death Star project to the Emperor. 
20208 32 Emperor Palpatine, realizing the hopelessness of stopping the rebel infiltration of the Imperial Senate, dissolves that body permanently,  the last remnants of the Old Republic are swept away. Regional governors now have direct control of their territory.
20208 32 Death Star I is completed and is used against the rebel fortress world of Alderaan, destroying the world completely. A major technological advancement for the Empire and a personal triumph for Grand Moff Tarkin.
20208 32 Rebel terrorists destroy Death Star I, killing Grand Moff Tarkin at Yavin IV. The Emperor declares Tarkin a Martyr of the Empire and he is inducted in the Hall of Martyrs on Had Abbadon. The Emperor vows revenge for this ignoble act.
20209 33 First contact with the Sines Union. Premier Yusi Ata Ehg and Emperor Palpatine form a historic alliance. Our Imperial forces are granted free access to Sines space and Sines troops are welcomed into the Imperial Armed forces.
2010 34 The Executor is completed and begins worthiness trials, it is the largest warship ever built, a sister ship, Cracken, is completed one month later, in all 14 such vessels are built further affirming the Imperial Navy as the most powerful in recorded history.
20211 35 Emperor Palpatine begins to move governmental offices to the planet Had Abbadon, Coruscant, however,  remains the capital of the Empire.
20212 36 The battle of Hoth forces the rebel terrorists further out of civilized space. Lord Darth Vader is credited with rooting out this criminal stronghold. General Maximillian Veers is elevated to the position of Moff and given the Kozor Sector to govern.
20213 37 Grand Moff Udul Kasto, a personal friend of the Emperor retires and is honored with the title of Viceroy of Coruscant. As a Grand Moff, Kasto was responsible for the organization of alien labor to meet the ever growing needs of our Empire.