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CodeSystem: NASA Schedule Offset Notation
Official URL : https://mitre.org/fhir/space-health/CodeSystem/nasa-schedule-offset-cs
Version :
0.5.12
Active
as of 2026-03-25
Computable Name : NASAScheduleOffsetCS
L-minus and R-plus notation codes for mission timeline scheduling.
This Code system is referenced in the content logical definition of the following value sets:
This case-sensitive code system https://mitre.org/fhir/space-health/CodeSystem/nasa-schedule-offset-cs defines the following codes:
Code Display Definition L-24m
L-24 months
24 months before launch L-19m
L-19 months
19 months before launch L-12m
L-12 months
12 months before launch L-9m
L-9 months
9 months before launch L-6m
L-6 months
6 months before launch L-180d
L-180 days
180 days before launch L-90d
L-90 days
90 days before launch L-45d
L-45 days
45 days before launch L-30d
L-30 days
30 days before launch L-15d
L-15 days
15 days before launch L-10d
L-10 days
10 days before launch L-7d
L-7 days
7 days before launch L-3d
L-3 days
3 days before launch L-0
L-0
Launch day R-0
R+0
Return/landing day R-3d
R+3 days
3 days after return R-5d
R+5 days
5 days after return R-7d
R+7 days
7 days after return R-14d
R+14 days
14 days after return R-30d
R+30 days
30 days after return R-45d
R+45 days
45 days after return R-60d
R+60 days
60 days after return FD-21
Flight Day 21
21st day of flight FD-mid
Mid-Mission
Midpoint of mission duration