Table of Julian Day Numbers, 1950-2100

TABLE OF JULIAN DAY NUMBERS 1950 - 2100

D.G. SIMPSON

JUNE 2012

GODDARD SPACE FLIGHT CENTER

GREENBELT, MARYLAND

TABLE OF JULIAN DAY NUMBERS 1950 ? 2100

D. G. Simpson Science Data Processing Branch

June 2012

GODDARD SPACE FLIGHT CENTER Greenbelt, Maryland

TABLE OF JULIAN DAY NUMBERS 1950 ? 2100

D. G. Simpson Science Data Processing Branch

ABSTRACT This document tabulates the Julian day numbers at 00:00 hours Universal Time for each day for the years 1950 ? 2100.

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CONTENTS Page

ABSTRACT ............................................................................... iii INTRODUCTION ....................................................................... 1 TABLE ..................................................................................... 3

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TABLE OF JULIAN DAY NUMBERS, 1950 ? 2100

INTRODUCTION The Julian day number is a uniform time scale often used in astronomy and related applications. It is defined to be the total number of days elapsed since 12h UT (universal time) on Monday, January 1, 4713 B.C. (on the Old Style, or Julian, calendar). The Julian day number is often convenient as a uniform time axis for plotting, or as a simple method for computing the number of days between two calendar dates. The following pages give the Julian day numbers at 0h UT for each day for the 151 years between 1950 and 2100. The three digits at the top of each column should be added in front of the number tabulated. For example, the Julian day for January 1, 1950, 0h UT is 2433282.5. A fractional day may be added to the Julian day numbers tabulated. For example, for 18h UT on January 1, 1950, the Julian day number is 2433282.5 + 18/24 = 2433283.25. To find the Modified Julian Day (MJD), subtract 2400000.5 from the Julian day number. For example, the Modified Julian Day for January 1, 1950, 18h UT is 33282.75. To find the day of week for any date, add 1.5 to the tabulated Julian day number and divide the result by 7. A remainder of 0 indicates a Sunday, 1 a Monday, 2 a Tuesday, 3 a Wednesday, 4 a Thursday, 5 a Friday, and 6 a Saturday. For example, the tabulated Julian day number for January 1, 1950 is 2433282.5. Adding 1.5 and dividing by 7 gives 347612 with a remainder of 0, so this date is a Sunday.

Reference: Astronomical Algorithms (2nd ed.) by Jean Meeus. Willmann-Bell, Richmond, 1998.

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Date 0h UT

Julian Day

243 Jan. 0 3281.5

1 3282.5 2 3283.5 3 3284.5 4 3285.5 5 3286.5 6 3287.5 7 3288.5 8 3289.5 9 3290.5 10 3291.5 11 3292.5 12 3293.5 13 3294.5 14 3295.5 15 3296.5 16 3297.5 17 3298.5 18 3299.5 19 3300.5 20 3301.5 21 3302.5 22 3303.5 23 3304.5 24 3305.5 25 3306.5 26 3307.5 27 3308.5 28 3309.5 29 3310.5 30 3311.5 31 3312.5 Feb. 1 3313.5 2 3314.5 3 3315.5 4 3316.5 5 3317.5 6 3318.5 7 3319.5 8 3320.5 9 3321.5 10 3322.5 11 3323.5 12 3324.5 13 3325.5 14 3326.5

JULIAN DAYS, 1950

Date Julian 0h UT Day

243 Feb. 15 3327.5

16 3328.5 17 3329.5 18 3330.5 19 3331.5 20 3332.5 21 3333.5 22 3334.5 23 3335.5 24 3336.5 25 3337.5 26 3338.5 27 3339.5 28 3340.5 Mar. 1 3341.5

2 3342.5 3 3343.5 4 3344.5 5 3345.5 6 3346.5 7 3347.5 8 3348.5 9 3349.5 10 3350.5 11 3351.5 12 3352.5 13 3353.5 14 3354.5 15 3355.5 16 3356.5 17 3357.5 18 3358.5 19 3359.5 20 3360.5 21 3361.5 22 3362.5 23 3363.5 24 3364.5 25 3365.5 26 3366.5 27 3367.5 28 3368.5 29 3369.5 30 3370.5 31 3371.5 Apr. 1 3372.5

Date Julian 0h UT Day

243 Apr. 2 3373.5

3 3374.5 4 3375.5 5 3376.5 6 3377.5 7 3378.5 8 3379.5 9 3380.5 10 3381.5 11 3382.5 12 3383.5 13 3384.5 14 3385.5 15 3386.5 16 3387.5 17 3388.5 18 3389.5 19 3390.5 20 3391.5 21 3392.5 22 3393.5 23 3394.5 24 3395.5 25 3396.5 26 3397.5 27 3398.5 28 3399.5 29 3400.5 30 3401.5 May 1 3402.5 2 3403.5 3 3404.5 4 3405.5 5 3406.5 6 3407.5 7 3408.5 8 3409.5 9 3410.5 10 3411.5 11 3412.5 12 3413.5 13 3414.5 14 3415.5 15 3416.5 16 3417.5 17 3418.5

Date Julian 0h UT Day

243 May 18 3419.5

19 3420.5 20 3421.5 21 3422.5 22 3423.5 23 3424.5 24 3425.5 25 3426.5 26 3427.5 27 3428.5 28 3429.5 29 3430.5 30 3431.5 31 3432.5 June 1 3433.5 2 3434.5 3 3435.5 4 3436.5 5 3437.5 6 3438.5 7 3439.5 8 3440.5 9 3441.5 10 3442.5 11 3443.5 12 3444.5 13 3445.5 14 3446.5 15 3447.5 16 3448.5 17 3449.5 18 3450.5 19 3451.5 20 3452.5 21 3453.5 22 3454.5 23 3455.5 24 3456.5 25 3457.5 26 3458.5 27 3459.5 28 3460.5 29 3461.5 30 3462.5 July 1 3463.5 2 3464.5

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Date 0h UT

Julian Day

243 July 1 3463.5

2 3464.5 3 3465.5 4 3466.5 5 3467.5 6 3468.5 7 3469.5 8 3470.5 9 3471.5 10 3472.5 11 3473.5 12 3474.5 13 3475.5 14 3476.5 15 3477.5 16 3478.5 17 3479.5 18 3480.5 19 3481.5 20 3482.5 21 3483.5 22 3484.5 23 3485.5 24 3486.5 25 3487.5 26 3488.5 27 3489.5 28 3490.5 29 3491.5 30 3492.5 31 3493.5 Aug. 1 3494.5 2 3495.5 3 3496.5 4 3497.5 5 3498.5 6 3499.5 7 3500.5 8 3501.5 9 3502.5 10 3503.5 11 3504.5 12 3505.5 13 3506.5 14 3507.5 15 3508.5

JULIAN DAYS, 1950

Date 0h UT

Julian Day

243 Aug. 16 3509.5

17 3510.5 18 3511.5 19 3512.5 20 3513.5 21 3514.5 22 3515.5 23 3516.5 24 3517.5 25 3518.5 26 3519.5 27 3520.5 28 3521.5 29 3522.5 30 3523.5 31 3524.5 Sept. 1 3525.5

2 3526.5 3 3527.5 4 3528.5 5 3529.5 6 3530.5 7 3531.5 8 3532.5 9 3533.5 10 3534.5 11 3535.5 12 3536.5 13 3537.5 14 3538.5 15 3539.5 16 3540.5 17 3541.5 18 3542.5 19 3543.5 20 3544.5 21 3545.5 22 3546.5 23 3547.5 24 3548.5 25 3549.5 26 3550.5 27 3551.5 28 3552.5 29 3553.5 30 3554.5

Date Julian 0h UT Day

243 Oct. 1 3555.5

2 3556.5 3 3557.5 4 3558.5 5 3559.5 6 3560.5 7 3561.5 8 3562.5 9 3563.5 10 3564.5 11 3565.5 12 3566.5 13 3567.5 14 3568.5 15 3569.5 16 3570.5 17 3571.5 18 3572.5 19 3573.5 20 3574.5 21 3575.5 22 3576.5 23 3577.5 24 3578.5 25 3579.5 26 3580.5 27 3581.5 28 3582.5 29 3583.5 30 3584.5 31 3585.5 Nov. 1 3586.5 2 3587.5 3 3588.5 4 3589.5 5 3590.5 6 3591.5 7 3592.5 8 3593.5 9 3594.5 10 3595.5 11 3596.5 12 3597.5 13 3598.5 14 3599.5 15 3600.5

Date Julian 0h UT Day

243 Nov. 16 3601.5

17 3602.5 18 3603.5 19 3604.5 20 3605.5 21 3606.5 22 3607.5 23 3608.5 24 3609.5 25 3610.5 26 3611.5 27 3612.5 28 3613.5 29 3614.5 30 3615.5 Dec. 1 3616.5

2 3617.5 3 3618.5 4 3619.5 5 3620.5 6 3621.5 7 3622.5 8 3623.5 9 3624.5 10 3625.5 11 3626.5 12 3627.5 13 3628.5 14 3629.5 15 3630.5 16 3631.5 17 3632.5 18 3633.5 19 3634.5 20 3635.5 21 3636.5 22 3637.5 23 3638.5 24 3639.5 25 3640.5 26 3641.5 27 3642.5 28 3643.5 29 3644.5 30 3645.5 31 3646.5

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Date 0h UT

Julian Day

243 Jan. 0 3646.5

1 3647.5 2 3648.5 3 3649.5 4 3650.5 5 3651.5 6 3652.5 7 3653.5 8 3654.5 9 3655.5 10 3656.5 11 3657.5 12 3658.5 13 3659.5 14 3660.5 15 3661.5 16 3662.5 17 3663.5 18 3664.5 19 3665.5 20 3666.5 21 3667.5 22 3668.5 23 3669.5 24 3670.5 25 3671.5 26 3672.5 27 3673.5 28 3674.5 29 3675.5 30 3676.5 31 3677.5 Feb. 1 3678.5 2 3679.5 3 3680.5 4 3681.5 5 3682.5 6 3683.5 7 3684.5 8 3685.5 9 3686.5 10 3687.5 11 3688.5 12 3689.5 13 3690.5 14 3691.5

JULIAN DAYS, 1951

Date Julian 0h UT Day

243 Feb. 15 3692.5

16 3693.5 17 3694.5 18 3695.5 19 3696.5 20 3697.5 21 3698.5 22 3699.5 23 3700.5 24 3701.5 25 3702.5 26 3703.5 27 3704.5 28 3705.5 Mar. 1 3706.5

2 3707.5 3 3708.5 4 3709.5 5 3710.5 6 3711.5 7 3712.5 8 3713.5 9 3714.5 10 3715.5 11 3716.5 12 3717.5 13 3718.5 14 3719.5 15 3720.5 16 3721.5 17 3722.5 18 3723.5 19 3724.5 20 3725.5 21 3726.5 22 3727.5 23 3728.5 24 3729.5 25 3730.5 26 3731.5 27 3732.5 28 3733.5 29 3734.5 30 3735.5 31 3736.5 Apr. 1 3737.5

Date Julian 0h UT Day

243 Apr. 2 3738.5

3 3739.5 4 3740.5 5 3741.5 6 3742.5 7 3743.5 8 3744.5 9 3745.5 10 3746.5 11 3747.5 12 3748.5 13 3749.5 14 3750.5 15 3751.5 16 3752.5 17 3753.5 18 3754.5 19 3755.5 20 3756.5 21 3757.5 22 3758.5 23 3759.5 24 3760.5 25 3761.5 26 3762.5 27 3763.5 28 3764.5 29 3765.5 30 3766.5 May 1 3767.5 2 3768.5 3 3769.5 4 3770.5 5 3771.5 6 3772.5 7 3773.5 8 3774.5 9 3775.5 10 3776.5 11 3777.5 12 3778.5 13 3779.5 14 3780.5 15 3781.5 16 3782.5 17 3783.5

Date Julian 0h UT Day

243 May 18 3784.5

19 3785.5 20 3786.5 21 3787.5 22 3788.5 23 3789.5 24 3790.5 25 3791.5 26 3792.5 27 3793.5 28 3794.5 29 3795.5 30 3796.5 31 3797.5 June 1 3798.5 2 3799.5 3 3800.5 4 3801.5 5 3802.5 6 3803.5 7 3804.5 8 3805.5 9 3806.5 10 3807.5 11 3808.5 12 3809.5 13 3810.5 14 3811.5 15 3812.5 16 3813.5 17 3814.5 18 3815.5 19 3816.5 20 3817.5 21 3818.5 22 3819.5 23 3820.5 24 3821.5 25 3822.5 26 3823.5 27 3824.5 28 3825.5 29 3826.5 30 3827.5 July 1 3828.5 2 3829.5

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