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JuliaSpace · Jan 1, 2025 · d5d8aef · d5d8aef
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diff --git a/docs/src/man/orbit_representations.md b/docs/src/man/orbit_representations.md
@@ -172,8 +172,9 @@ only one *of date* frame, the first signature is used and the Julian Day `jd_utc
 the epoch of this frame. On the other hand, if the origin and destination frame contain two
 *of date* frame[^1], e.g. TOD => MOD, the second signature must be used in which the Julian
 Day `jd_utco` [UTC] is the epoch of the origin frame and the Julian Day `jd_utcf` [UTC] is
-the epoch of the destination frame. The algorithm might also require the Earth Orientation
-Parameters (EOP) `eop` depending on the source and destination frames.
+the epoch of the destination frame. If the epochs are not provided, the algorithm will use
+the epoch of the orbit state vector `sv` (`sv.t`). The algorithm might also require the
+Earth Orientation Parameters (EOP) `eop` depending on the source and destination frames.
 
 The specification about the origin and destination frames, as well as the requirements for
 the EOP data, are the same as described for the [`r_eci_to_eci`](@ref) function.

diff --git a/src/orbit/sv_eci_to_eci.jl b/src/orbit/sv_eci_to_eci.jl
@@ -22,8 +22,9 @@ only one *of date* frame, the first signature is used and the Julian Day `jd_utc
 the epoch of this frame. On the other hand, if the origin and destination frame contain two
 *of date* frame`¹`, e.g. TOD => MOD, the second signature must be used in which the Julian
 Day `jd_utco` [UTC] is the epoch of the origin frame and the Julian Day `jd_utcf` [UTC] is
-the epoch of the destination frame. The algorithm might also require the Earth Orientation
-Parameters (EOP) `eop` depending on the source and destination frames.
+the epoch of the destination frame. If the epochs are not provided, the algorithm will use
+the epoch of the orbit state vector `sv` (`sv.t`). The algorithm might also require the
+Earth Orientation Parameters (EOP) `eop` depending on the source and destination frames.
 
 !!! note