The Sabbath is the 7th day of the week and literally means “rest”, it also the first Holiday ordained by the Most High, creator of heaven and earth. The Sun and moon were created on the fourth (4th ) day of creation and three days later on the 7th day the Sabbath was established. Proving the Sabbath is not based upon the lunar (moon) calendar.
Genesis 2:1 Thus the heavens and the earth were finished, and all the host of them.  And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.  And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
Exodus 20:8 Remember the sabbath day, to keep it holy.
Many are confused about “Remember the Sabbath” what does that mean? How do we keep it holy? This the same confusion that comes about with not doing thy Pleasure of the Sabbth-
Isaiah 58:13 If thou turn away thy foot from the sabbath, from doing thy pleasure on my holy day; and call the sabbath a delight, the holy of the LORD, honourable; and shalt honour him, not doing thine own ways, nor finding thine own pleasure, nor speaking thine own words:  Then shalt thou delight thyself in the LORD; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the LORD hath spoken it.
So how do we remember the Sabbath and not do our own pleasure? You remember the Sabbath by keeping the laws that pertain to the Sabbath which is the same as not doing thy own pleasure.
Let examine the laws that pertain to the Sabbath.
Exodus 20:9 Six days shalt thou labour, and do all thy work:  But the seventh day is the sabbath of the LORD thy God: in it thou shalt not do any work, thou, nor thy son, nor thy daughter, thy manservant, nor thy maidservant, nor thy cattle, nor thy stranger that is within thy gates:  For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it.
Exodus 35:3 Ye shall kindle no fire throughout your habitations upon the sabbath day.
This also includes no microwaves.
Exodus 16:23 And he said unto them, This is that which the LORD hath said, To morrow is the rest of the holy sabbath unto the LORD: bake that which ye will bake to day, and seethe that ye will seethe; and that which remaineth over lay up for you to be kept until the morning.
NO BUYING OR SELLING
Nehemiah 10:31 And if the people of the land bring ware or any victuals on the sabbath day to sell, that we would not buy it of them on the sabbath, or on the holy day: and that we would leave the seventh year, and the exaction of every debt.
Nehemiah 13:15 In those days saw I in Judah some treading wine presses on the sabbath, and bringing in sheaves, and lading asses; as also wine, grapes, and figs, and all manner of burdens, which they brought into Jerusalem on the sabbath day: and I testified against them in the day wherein they sold victuals.  There dwelt men of Tyre also therein, which brought fish, and all manner of ware, and sold on the sabbath unto the children of Judah, and in Jerusalem.  Then I contended with the nobles of Judah, and said unto them, What evil thing is this that ye do, and profane the sabbath day?  Did not your fathers thus, and did not our God bring all this evil upon us, and upon this city? yet ye bring more wrath upon Israel by profaning the sabbath.  And it came to pass, that when the gates of Jerusalem began to be dark before the sabbath, I commanded that the gates should be shut, and charged that they should not be opened till after the sabbath: and some of my servants set I at the gates, that there should no burden be brought in on the sabbath day.  So the merchants and sellers of all kind of ware lodged without Jerusalem once or twice.  Then I testified against them, and said unto them, Why lodge ye about the wall? if ye do so again, I will lay hands on you. From that time forth came they no more on the sabbath.
Mark 2:27 And he said unto them, The sabbath was made for man, and not man for the sabbath:
 Therefore the Son of man is Lord also of the sabbath.
The Sabbath was made for what man?
Exodus 31:16 Wherefore the children of Israel shall keep the sabbath, to observe the sabbath throughout their generations, for a perpetual covenant.  It is a sign between me and the children of Israel for ever: for in six days the LORD made heaven and earth, and on the seventh day he rested, and was refreshed.