Triennial Torah reading cycle

https://www.hebcal.com/home/50/what-is-the-triennial-torah-reading-cycle

I'm sorry - I am wondering what "triennial leyning" is? Are you referring to the gomorra that says they leyning schedule used to be a period of 3 years to lain through the Torah? How would we know how that schedule worked? Are you referring to something else?

Thanks,

Eli

{
    "items": [{
        "title": "Parashat Balak",
        "category": "parashat",
        "hebrew": "פרשת בלק",
        "leyning": {
            "6": "Numbers 23:27 - 24:13",
            "2": "Numbers 22:13 - 22:20",
            "torah": "Numbers 22:2 - 25:9",
            "triennial": {
                "1": "Numbers 22:39 - 22:41",
                "4": "Numbers 23:7 - 23:12",
                "maftir": "Numbers 23:19 - 23:26",
                "3": "Numbers 23:4 - 23:6",
                "7": "Numbers 23:19 - 23:26",
                "5": "Numbers 23:13 - 23:15",
                "2": "Numbers 23:1 - 23:3",
                "6": "Numbers 23:16 - 23:18"
            },
            "5": "Numbers 23:13 - 23:26",
            "7": "Numbers 24:14 - 25:9",
            "haftarah": "Micah 5:6 - 6:8",
            "3": "Numbers 22:21 - 22:38",
            "maftir": "Numbers 25:7 - 25:9",
            "4": "Numbers 22:39 - 23:12",
            "1": "Numbers 22:2 - 22:12"
        },
        "date": "2015-07-04",
        "link": "http://www.hebcal.com/sedrot/balak"
    }, {
        "link": "http://www.hebcal.com/sedrot/pinchas",
        "date": "2015-07-11",
        "leyning": {
            "7": "Numbers 29:12 - 30:1",
            "triennial": {
                "7": "Numbers 28:11 - 28:15",
                "5": "Numbers 27:15 - 27:23",
                "6": "Numbers 28:1 - 28:10",
                "2": "Numbers 26:57 - 26:62",
                "maftir": "Numbers 28:11 - 28:15",
                "3": "Numbers 26:63 - 27:5",
                "1": "Numbers 26:52 - 26:56",
                "4": "Numbers 27:6 - 27:14"
            },
            "5": "Numbers 28:1 - 28:15",
            "torah": "Numbers 25:10 - 30:1",
            "6": "Numbers 28:16 - 29:11",
            "2": "Numbers 26:5 - 26:51",
            "1": "Numbers 25:10 - 26:4",
            "4": "Numbers 27:6 - 27:23",
            "maftir": "Numbers 29:35 - 30:1",
            "3": "Numbers 26:52 - 27:5",
            "haftarah": "Jeremiah 1:1 - 2:3 | Pinchas occurring after 17 Tammuz"
        },
        "hebrew": "פרשת פינחס",
        "category": "parashat",
        "title": "Parashat Pinchas"
    }, {
        "link": "http://www.hebcal.com/sedrot/matotmasei",
        "date": "2015-07-18",
        "hebrew": "פרשת מטות־מסעי",
        "leyning": {
            "7": "Numbers 35:9 - 36:13",
            "triennial": {
                "1": "Numbers 32:1 - 32:4",
                "4": "Numbers 32:28 - 32:42",
                "maftir": "Numbers 33:47 - 33:49",
                "3": "Numbers 32:20 - 32:27",
                "5": "Numbers 33:1 - 33:10",
                "7": "Numbers 33:37 - 33:49",
                "6": "Numbers 33:11 - 33:36",
                "2": "Numbers 32:5 - 32:19"
            },
            "5": "Numbers 33:50 - 34:15",
            "torah": "Numbers 30:2 - 36:13",
            "6": "Numbers 34:16 - 35:8",
            "2": "Numbers 31:13 - 31:54",
            "1": "Numbers 30:2 - 31:12",
            "4": "Numbers 32:20 - 33:49",
            "maftir": "Numbers 36:11 - 36:13",
            "haftarah": "Jeremiah 2:4 - 28; 3:4",
            "3": "Numbers 32:1 - 32:19"
        },
        "category": "parashat",
        "title": "Parashat Matot-Masei"
    }, {
        "title": "Parashat Devarim",
        "category": "parashat",
        "link": "http://www.hebcal.com/sedrot/devarim",
        "date": "2015-07-25",
        "hebrew": "פרשת דברים",
        "leyning": {
            "2": "Deuteronomy 1:11 - 1:21",
            "6": "Deuteronomy 2:31 - 3:14",
            "torah": "Deuteronomy 1:1 - 3:22",
            "7": "Deuteronomy 3:15 - 3:22",
            "triennial": {
                "1": "Deuteronomy 2:2 - 2:5",
                "4": "Deuteronomy 2:17 - 2:19",
                "maftir": "Deuteronomy 2:28 - 2:30",
                "3": "Deuteronomy 2:13 - 2:16",
                "7": "Deuteronomy 2:26 - 2:30",
                "5": "Deuteronomy 2:20 - 2:22",
                "2": "Deuteronomy 2:6 - 2:12",
                "6": "Deuteronomy 2:23 - 2:25"
            },
            "5": "Deuteronomy 2:2 - 2:30",
            "4": "Deuteronomy 1:39 - 2:1",
            "1": "Deuteronomy 1:1 - 1:10",
            "3": "Deuteronomy 1:22 - 1:38",
            "haftarah": "Isaiah 1:1 - 1:27",
            "maftir": "Deuteronomy 3:20 - 3:22"
        }
    }],
    "location": {
        "geo": "none"
    },
    "title": "Hebcal July 2015",
    "link": "http://www.hebcal.com/hebcal/?v=1;s=on;year=2015;month=7;c=off",
    "date": "2015-07-12T20:29:57-00:00"
}