現今銀河普遍使用的計時曆法，由星際和平公司制定並推行。琥珀紀以「存護」星神的推定誕生時為元紀，以克里珀每次揮錘敲擊為新一紀的啟始。
由於克里珀揮錘的間隔不定，每一琥珀紀的長度存在較大浮動。以開拓歷換算，1琥珀紀約為76～240年不等。
星穹列車重新起航時值琥珀2157紀。
Amber Era (Calendar)
The calendar commonly used in the cosmos, created and promoted by the Interastral Peace Corporation. The Amber Era started at the estimated birth of Qlipoth as the Aeon of Preservation, and initiates a new Era every time Qlipoth swings their hammer during construction.
As Qlipoth swings their hammer at unpredictable intervals, the duration of every Amber Era varies significantly. The length of one Amber Era has been anywhere between 76 to 240 Trailblaze Years when converted.
The Astral Express restarted its journey on 2157 Amber Era (AE).
