The phrase 'between the evenings' is found in the original Hebrew in a
number of scriptures.


   a)  When God gave quail to the children of Israel in the
       wilderness.

       Exod 16:12  "I have heard the murmurings of the children
                   of Israel. Speak to them, saying, At twilight
                   (between the evenings) you shall eat meat,
                   and in the morning you shall be filled with
                   bread. And you shall know that I am the LORD
                   your God.

b) When the second daily lamb was to be offered. Exod 29:39 One lamb you shall offer in the morning, and the other lamb you shall offer at twilight (between the evenings).

       Exod  29:41  And the other lamb you shall offer at twilight
                    (between the evenings); and you shall offer with
                    it the grain offering and the drink offering, as
                    in the morning, for a sweet aroma, an offering
                    made by fire to the LORD.

       Num   28:4   The one lamb you shall offer in the morning,
                    the other lamb you shall offer in the evening
                    (between the evenings).

       Num   28:8   The other lamb you shall offer in the evening
                    (between the evenings); as the morning grain
                    and its drink offering, you shall offer it as
                    an offering made by fire, a sweet aroma to the
                    LORD.


   c)  When Aaron lit the lamps.

       Exod  30:8   And when Aaron lights the lamps at twilight
                    (between the evenings), he shall burn incense
                    on it, a perpetual incense before the LORD
                    throughout your generations.


   d)  When the Passover lamb was killed.

       Exod  12:6   Now you shall keep it until the fourteenth
                    day of the same month. Then the whole assembly
                    of the congregation of Israel shall kill it
                    at twilight (between the evenings).


   e)  When the feast of the LORD's Passover was observed.

       Lev   23:4   These are the feasts of the LORD, holy convocations
                    which you shall proclaim at their appointed times.
               :5   On the fourteenth day of the first month at twilight
                    (between the evenings) is the LORD's Passover.

       Num    9:3   On the fourteenth day of this month, at twilight
                    (between the evenings), you shall keep it at its
                    appointed time. According to all its rites and
                    ceremonies you shall keep it.

       Num    9:5   And they kept the Passover on the fourteenth day of
                    the first month, at twilight (between the evenings),
                    in the Wilderness of Sinai; according to all that
                    the LORD commanded Moses, so the children of Israel
                    did.

       Num    9:11  On the fourteenth day of the second month, at
                    twilight (between the evenings), they may keep it.
                    They shall eat it with unleavened bread and bitter
                    herbs.




Becoming aware that there are two evenings in a day, does not necessarily
mean that sunset does not end the day. However, it does create a need to
identify the second evening and consider the possibility that the second
evening, and not sunset, may end the day. 


To explain the two evenings some have suggested they represent the times
of 1)sunset and 2)arrival of night, ie so that 'between the evenings'
represents dusk.

Others feel the first evening is a time prior to sunset; such as 3.00pm
in the afternoon, when the shadows start to lengthen and it becomes
apparent the work day is coming to an end. 


Before considering such issues we should note how Scripture describes
the daylight period.

       Jer   31:35  Thus says the LORD,
                    Who gives the sun for a light by day,
                    And the ordinances of the moon and the stars
                    for a light by night, ...

       John  11:9   Jesus answered, "Are there not twelve hours
                    in the day? If anyone walks in the day, he
                    does not stumble, because he sees the light
                    of this world.


These verses seem to indicate a 24 hour day is composed of 12 hours
of daylight and another 12 hours of night. There is no inference of
any lessening of the night to 10 hours in order to cater for an hour
of dusk after sunset and another hour before sunrise. Rather, it seems
a particular point in time would either fall in the period of daylight
or the period of night.


Few of the activities which fell 'between the evenings' are precisely
timed. There is though a verse which indicates the 2nd lamb was offered
after sunset.


    Lev   6:20  This is the offering of Aaron and his sons,
                which they shall offer to the LORD, beginning
                on the day when he is anointed: one-tenth
                of an ephah of fine flour as a daily grain
                offering, half of it in the morning and half
                of it at night.


Half the grain offering was offered with the evening lamb, so this
means the 2nd lamb was also offered at 'night', ie after sunset.


The ritual observance which provides the best indicator of the timing
of the period 'between the evenings' is Passover.