Romulan calendar

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  • Units
    • Ewa (Romulan second) (ENT Novel: The Good That Men Do; VAN Novel: Summon the Thunder)
    • Siure (Romulan minute) (ENT Novel: The Good That Men Do, Beneath the Raptor's Wing)
      • Plural: siuren (ENT Novel: Beneath the Raptor's Wing)
      • Approximately 50 seconds (ENT Novel: Beneath the Raptor's Wing)
        • 12 siuren is equal to "a little over ten minutes" by that work
    • Dierha (Romulan hour) (ENT Novel: The Good That Men Do; VAN Novel: Summon the Thunder)
    • Eisae (Romulan day) (ENT Novel: The Good That Men Do, To Brave the Storm)
      • Also known as a ch'Rihanturn (ENT Novel: Beneath the Raptor's Wing)
      • ~26 hours (TNG Novel: Death in Winter)
    • Khaidoa (Romulan month) (ENT Novel: The Good That Men Do, Kobayashi Maru, Beneath the Raptor's Wing)
    • Fvheisn (Romulan year) (ENT Novel: The Good That Men Do, Beneath the Raptor's Wing)
      • 11-12 khaidoa to a fvheisn (ENT Novel: Beneath the Raptor's Wing)
        • six khaidoa is "half a fvheisn or more" by that work
  • Months
    • Tasmeen (ENT Novel: The Good That Men Do, To Brave the Storm)
      • At least twenty-one days (ENT Novel: The Good That Men Do)
    • Havreen (ENT Novel: The Good That Men Do)
      • At least eight days (ENT Novel: The Good That Men Do)
      • Immediately follows Tasmeen
    • K'ri'lior (ENT Novel: Beneath the Raptor's Wing)
      • At least 44 days (ENT Novel: Beneath the Raptor's Wing)
      • Shortly after Tasmeen (ENT Novel: Beneath the Raptor's Wing)
        • "More than a full fvheisn" between Tasmeen 11 of the previous year and K'ri'lior 10 of that reference's
    • et'Khior (ENT Novel: Beneath the Raptor's Wing)
      • At least 4 days (ENT Novel: Beneath the Raptor's Wing)
    • K'ri'Brax (ENT Novel: Kobayashi Maru)
      • At least 40 days (ENT Novel: Kobayashi Maru)
      • "A few khaidoa" after Havreen (ENT Novel: Kobayashi Maru)
        • Between February 23, 2155 (Coridan Prime attack, late Tasmeen/Havreen), and K'ri'Brax 29 (ENT Novel: Kobayashi Maru)
      • February 21, 2155 (late Tasmeen/early Havreen) "two khaidoa" before K'ri'Brax 33 (ENT Novel: Kobayashi Maru)
        • First event Ehrein's rescue from Rator II, Chapter 38 of The Good That Men Do
      • "Some three khaidoa" between Tasmeen 5 and K'ri'Brax 33 (ENT Novel: Kobayashi Maru)
        • Between Cunaehr's death, chapter 1 of The Good That Men Do, and chapter 11 of Kobayashi Maru
    • re'T'Khutai (ENT Novel: Beneath the Raptor's Wing)
      • Apparently immediately following K'ri'Brax by correspondences
      • At least 3 days (ENT Novel: Beneath the Raptor's Wing)
    • Khuti (ENT Novel: Beneath the Raptor's Wing, To Brave the Storm)
      • At least 43 days (ENT Novel: To Brave the Storm)
    • ta'Krat (ENT Novel: To Brave the Storm)
      • At least 7 days (ENT Novel: To Brave the Storm)
    • T'Ke'Tas (ENT Novel: To Brave the Storm)
      • At least 43 days (ENT Novel: To Brave the Storm)
  • Correspondences
    • Nearly three fvheisn between April 17, 2152 and early February 2155 (ENT Novel: The Good That Men Do)
      • Between "Minefield" and chapter 4 of The Good That Men Do
    • Mid-November 2154 "the previous fvheisn" from July 2155 (ENT Novel: Kobayashi Maru)
      • Between "Babel One"/"United"/"The Aenar" and chapter 11 of Kobayashi Maru
    • Late-January to early-February 2155 "more than a full fvheisn" before February 11, 2156 (ENT Novel: Beneath the Raptor's Wing)
      • Between chapter 4 of The Good That Men Do and chapter 39 of Beneath the Raptor's Wing
    • Tasmeen 5, year of D'Era 1178 > January 24, 2155 (ENT Novel: The Good That Men Do)
      • Year derived from calculations, see below
    • January 30, 2155 > Tasmeen 11, year of D'Era 1178 > February 3, 2155 (ENT Novel: The Good That Men Do)
    • February 9, 2155 = Tasmeen 21, year of D'Era 1178 (ENT Novel: The Good That Men Do)
    • March 3, 2155 > Havreen 8, year unknown > March 21, 2155 (ENT Novel: The Good That Men Do)
    • July 13, 2155 > K'ri'Brax 29, year unknown > July 14, 2155 (ENT Novel: Kobayashi Maru)
    • July 14, 2155 > K'ri'Brax 30, year unknown > July 15, 2155 (ENT Novel: Kobayashi Maru)
    • July 15, 2155 = K'ri'Brax 31, year unknown (ENT Novel: Kobayashi Maru)
    • July 16, 2155 > K'ri'Brax 33, year unknown > July 17, 2155 (ENT Novel: Kobayashi Maru)
    • July 22, 2155 = K'ri'Brax 37, year unknown (ENT Novel: Beneath the Raptor's Wing)
    • July 22, 2155 = K'ri'Brax 39, year unknown (ENT Novel: Kobayashi Maru)
    • July 22, 2155 > K'ri'Brax 40, year unknown (ENT Novel: Kobayashi Maru)
    • July 30, 2155 = re'T'Khutai 3, year unknown (ENT Novel: Beneath the Raptor's Wing)
    • November 8, 2155 = Khuti 11, year of D'Era 1180 (ENT Novel: Beneath the Raptor's Wing)
      • Year by calculations below
    • February 11, 2156 = K'ri'lior 10, year of D'Era 1180 (ENT Novel: Beneath the Raptor's Wing)
      • "More than a full fvheisn" after Tasmeen 11, 1178 D'E above
      • Must be only barely into 1180 D'E, with Tasmeen 11 near end of 1178 D'E?
        • Yet Khuti 11 93 days (75-77.5 eisae, about 1/4 a fvheisn) earlier still in 1180
        • Possibly just weird turn of phrase
    • March 11, 2156 = K'ri'lior 39, year of D'Era 1180 (ENT Novel: Beneath the Raptor's Wing)
    • March 14, 2156 = K'ri'lior 42, year of D'Era 1180 (ENT Novel: Beneath the Raptor's Wing)
    • March 15, 2156 = K'ri'lior 43, year of D'Era 1180 (ENT Novel: Beneath the Raptor's Wing)
    • March 16, 2156 = K'ri'lior 44, year of D'Era 1180 (ENT Novel: Beneath the Raptor's Wing)
    • March 18, 2156 = et'Khior 2, year unknown (ENT Novel: Beneath the Raptor's Wing)
    • March 20, 2156 = et'Khior 4, year unknown (ENT Novel: Beneath the Raptor's Wing)
    • May 19, 2156 = T'ke'Tas 13, year unknown (ENT Novel: Beneath the Raptor's Wing)
    • June 20, 2156 = T'ke'Tas 43, year unknown (ENT Novel: Beneath the Raptor's Wing)
    • September 29, 2156 = Early in the month of Khuti, year of D'Era 1181 (ENT Novel: To Brave the Storm)
    • June 24, 2159 = Tasmeen 6, year of D'Era 1183 (ENT Novel: To Brave the Storm)
    • May 1, 2160 = Khuti 43, year of D'Era 1184 (ENT Novel: To Brave the Storm)
    • May 10, 2160 = ta'Krat 7, year of D'Era 1184 (ENT Novel: To Brave the Storm)
    • September 13, 2160 = T'Ke'Tas 43, year of D'Era 1184 (ENT Novel: To Brave the Storm)
  • Calculations
    • Eisae = [1.14,1.24] days
      • "Slightly more than four eisae" = "Nearly five Earth days"
    • February 9, 2155 = Tasmeen 21, unknown year, thus Tasmeen 6 on January 21-23 (given 1.14-1.24 days per eisae)
    • Tasmeen 6, 1183 D'E = June 24, 2159
      • Thus 1615-1617 days before day repeat
      • Between 1302.419 and 1418.421 eisae
    • Early Khuti 1181 D'E = September 29, 2156
      • 998 days between Khuti 1181 D'E and Tasmeen 6 1183 D'E
        • Between 804.839 and 875.439 eisae
        • Thus between 269 and 438 eisae per fvheisn extreme ranges (if Khuti and Tasmeen last and first months vs. first and last as extreme cases)
    • Khuti 11 ?? D'E = November 8, 2155
      • 326 days between Khuti 11 ?? D'E and Early Khuti 1181 D'E
      • Between 262.903 and 285.065 eisae, thus must be a single fvheisn
      • Thus fvheisn 269-~290 eisae (variance on upper bound depending when "early Khuti" actually is)
        • Odd length of year given many khaidoa with ~35-40 eisae, confirmed 11-12 khaidoa/fvheisn
        • Alternating extremely long and extremely small?
      • Thus Tasmeen 6 in 2155 must be 5 fvheisn earlier
        • 1302.419 eisae / 290 eisae = 4.5 fvheisn, smallest possible value
        • 1418.421 eisae / 269 eisae = 5.3 fvheisn, largest possible value
      • Thus Tasmeen 6 in 2155 between 1345 and 1450 eisae before Tasmeen 6 in 2159
      • Thus eisae no less than 1.201 days
      • Thus fvheisn no more than 283.6 eisae (1418.421 eisae = 5 fvheisn)
    • Check against correspondences
      • "Nearly three fvheisn" between April 17, 2152 and early February 2155
        • Between 1020 and 1033 days depending on exact position of latter
        • Thus between 822.58 and 860.83 eisae
        • 822.58 eisae / 3 = 274.19, 860.83 eisae / 3 = 286.94; nearly means must be below
        • Fits 269-283.6 range
    • Note that explicitly stated eisae/day equivalence in To Brave the Storm contradicts tendency in prior RW novels to increment Romulan date and Earth date in sync
  • Overall summary: references to Romulan calendar are fairly inconsistent in 22nd century ENT novels, and just use CLB's calendar from DTI